10 Most Reliable Cars With Inline 6 Engine

Cars with inline 6 engines are not new in the automotive industry. It has also been the best choice for car enthusiasts and automakers for a long time. We also know this engine as the straight-six engine, which is an internal combustion engine. A straight line runs along the crankcase, mounting six cylinders in a row. We know this type of engine because of its durability, fuel efficiency, and smoothness. This type of engine is more advanced than a V6 engine with the same displacement.It demonstrates creativity and automotive engineering with its distinctive design and outstanding performance.

It is the most reliable car with an inline 6 engine because of its performance. It makes it possible for an engine to be lighter and more compact while maintaining an amazing level of power and torque. Now this type of engine has become popular in vehicle segments, including sedans, sports cars, and commercial vehicles. Cars with inline 6 engines hold a special place in the automotive world. The Inline 6 engines have a long history in the automotive industry. This engine was first introduced in the early 1900’s in iconic cars such as the Ford Model T and the Chevrolet Corvette. It is a combination of performance and heritage.

Many automakers have used the unique characteristics of inline 6 engines to create robust performance vehicles. It comes with a unique design and visual aesthetic appeal. It has a symmetrical arrangement of cylinders and smooth-flowing lines of the cylinder. This creates a visually appealing design that attracts many car fans. We know Inline 6 engines for their hoarse exhaust note and powerful sound.

Advantages Of Cars With Inline 6 Engines

There are also many advantages of cars with inline 6-cylinder engines. Here you can check out the benefits of new cars with inline 6 engines.

Balanced Performance

Car enthusiasts know Inline 6 engines for their balanced performance. It has an equal number of cylinders on opposite sides of the engine. The torque distribution is even, which provides a smooth and responsive driving experience.

Excellent Torque Output

This engine has equally spaced cylinders that generate impressive torque at low RPM’s. It is best suited for vehicles that need strong low-end torque, such as muscle cars and performance vehicles.

Torque Steering

Cars with inline 6 engines always contribute to torque steering, giving drivers a thrilling experience. It occurs when the weight of the engine shifts during acceleration, which causes the wheels to turn slightly. Here, it enhances the driving experience and the sportiness of cars with inline 6 cylinder engines.

 Compact Design

These engines are compact, which allows for easier packaging and installation in vehicles. Its compactness contributes to improved vehicle handling and weight distribution.

Disadvantages Of Cars With Inline 6 Engines

There are still many benefits to inline 6 engines in cars but they also have some disadvantages. Here, I highlight its major disadvantages. 

Weight and Size

One of the main disadvantages of cars with inline 6 cylinder engines is their weight and size. When we compare them to other engine configurations, such as V6 or V8 engines, they are larger and heavier. It results in a less balanced weight distribution for the car. It also has negative impacts on handling and maneuverability. Its larger engine size also requires more space and potential. There is a need to compromise the car’s overall design.

Increased Maintenance and Complexity

Inline 6 engines in cars need more maintenance than other types of engines. It happens because it has more moving parts, which leads to increased wear and tear. Mostly, the configuration of these engines makes servicing and repairs more complex. When cylinders in a straight-six engine are evenly spaced, that makes it difficult to access individual components for service or repair.

Low Fuel Efficiency 

We know inline 6 engines for their power and torque, but they often offer lower fuel efficiency than smaller engine configurations. There are additional cylinders that contribute to higher fuel consumption, in cities. The engine weight negatively affects fuel efficiency, so it requires more power to move the vehicle.

Noise and Vibration

Inline 6 engines are smooth and quiet, but they can be noisier than some alternative engine configurations. It has a straight arrangement of cylinders that can cause vibrations. Here, it contributes to a noisy ride, particularly at higher speeds or when the engine is under stress.

Limited Engine Options

Cars with inline 6 engines have limited engine options available. They are complex and large. Many car manufacturers focus on providing more powerful and larger displacement engines. It limits buyers’ choice of whether are looking for smaller or more fuel-efficient engines.

Special Note for Readers: In this article, you can read the 10 most reliable cars with inline 6 engines. I hope you like this article and I researched this topic properly so my readers will get proper information.

Best 10 Cars With Inline 6 Engine 

In this part, you can check out the most reliable cars with inline 6 engines. Here I also give their features, specifications, and pros and cons.

1. BMW M88

Black colour BMW M88_11zon car

Check Out Its Specifications 

  • MSRP: $ 138,800
  • Engine: 3.5-liter inline-six engine
  • Horsepower: 273 @6500
  • Torque: 243@5000
  • MPG: 26 miles
  • Transmission: Allison XT-1400-2 transmission
  • Top Speed: 26 mph


  • Large HP
  • High-Quality Interiors
  • Reliable Engine
  • Less depreciation


  • Many Parts are not interchangeable
  • Some parts are Expensive
  • Special Maintenance & Repair
  • The timing chain is weak

When we discuss cars with inline 6-cylinder engines, the first car is the BMW M88. It is a high-performance engine that was produced between 1986 and 1988. engine in many BMW models, including the BMW M3 and the BMW M6. It is one of the best cars with an inline 6 engine. This is also known for its unique specifications and powerful performance.

Engine Specifications

  • Engine Type: Straight-6 Cylinder
  • Displacement: 3.5 liters
  • Horsepower: 256 horsepower at 6,500 pm
  • Torque: 300 Newton-meters at 5,500 pm
  • Compression Ratio: 9.0:1
  • Fuel System: Bosch Motronic Multipoint fuel injection
  • Aspiration: Twin turbochargers


The BMW M88 engine has exceptional performance capabilities. It offers a powerful and smooth driving experience, that makes it a popular choice among car buyers. Here it gives eminent power output such as 256 horsepower and 300 Newton-meters of torque. It provides ample power for aggressive driving. There is also quick and responsive acceleration, which allows drivers to accelerate confidently from low speeds. It generates strong torque from low RPMs, so it is suitable for both city and highway driving. The sound of the M88 engine is distinctive and captivates enthusiasts with its aggressive growl.

Engine Reliability

BMW is renowned for its build quality, and the BMW M88 engine is no exception. It is reliable and robust, which provides years of hassle-free performance. There is the engine’s solid construction. Here, it ensures durability and reliability, even under high-performance conditions. It is also equipped with a robust cooling system, including dual radiators and a cooling fan. It helps to prevent overheating. The engine uses high-quality internal components, such as forged pistons and connecting rods. It is also necessary for longer use.

Fuel Economy

Although the BMW M88 engine prioritizes performance, it offers decent fuel efficiency. Its Bosch Motronic Multipoint fuel injection system ensures precise fuel delivery. It reduces waste and improves efficiency. The M88 engine’s lightweight design helps reduce overall weight, improving fuel efficiency. BMW offers optional engine tuning options to optimize fuel efficiency.

2. BMW M30B35

Black colour BMW S54_11zon car

Check Out Its Specifications 

  • MSRP: $ 29,144.46
  • Engine: 3,430 cc
  • Horsepower: 208 @5700
  • Torque: 225@8000
  • MPG: 32
  • Transmission: Many Options
  • Top Speed: 140 mph


  • Outstanding turbo
  • Good power options
  • It boosts like a train
  • Looks elegant


  • Large car
  • It is expensive to buy, maintain, insure, and repair
  • Tickets will be expensive
  • Gas mileage sucks

The BMW M30B35 is a high-performance engine. BMW was developed, produced, and released in 1986. It was used in many BMW models, including the E30 325i and the E32 735i/735is. The M30B35 is more aggressive than the B34. It also has slightly more lift and 1 mm larger intake valves. The combustion chamber size is 65 cc, which is larger than the B34’s 58 cc. It has different pistons than the B34, which creates better combustion characteristics.

Engine Specifications

  • Engine Configuration: Straight-Six Cylinder, DOHC
  • Engine Displacement: 2,986 cc (182 cu in)
  • Bore and Stroke: It has 86.0 x 86.0 mm (3.39 x 3.39 in)
  • Fuel Delivery System: Bosch Motronic fuel injection
  • Compression Ratio: 10.0:1
  • Engine Management: Bosch Motronic 1.0


It gives the best performance. Its top speed is up to 140 mph, and its acceleration is 7.5 seconds. The BMW M30B35 has higher rpm limits and improved engine management. It also features the latest fuel injection technology and a high-performance exhaust system. The M30B35 is also fuel efficient and emits low levels of emissions. Improved engine management not only allows for higher rpm limits but also optimizes the performance of the engine by providing precise control over fuel injection and ignition timing. This results in enhanced power delivery, improved throttle response, and ultimately, a more exhilarating driving experience.

Reliability and Maintenance

The BMW M30B35 was known for its reliability and low maintenance requirements. A qualified mechanic can easily service it because of its high-mileage cap. It also featured a powerful engine that offered excellent performance. The M30B35 was a popular choice for drivers who wanted a reliable car that would last for a long time. The engine resists high mileage, making it a durable choice for long-term use. Additionally, BMW’s reputation for engineering excellence requires minimal maintenance requirements.

3. AMC 4.0-liter

White And Black colour AMC 4.0-liter car

Check Out Its Specifications 

  • MSRP: It depends on the Car Model
  • Engine: 4.0-liter inline six-cylinder engine
  • Horsepower: 180-185
  • Torque: 220lb-ft
  • MPG: 22
  • Transmission: 4-Speed Automatic Transmission
  • Top Speed: Depends on Model

The AMC 4.0-liter engine was a major advancement in automotive technology in the 1970s. (American Motors Corporation developed and produced this engine.) It is famous for its performance and reliability. The primary aim of this engine is to provide excellent performance and fuel efficiency. It occurs while maintaining high standards of reliability and durability. This engine was used in various AMC vehicles, including the Jeep Cherokee, AMC Gremlin, and AMC Concord.

Engine Specifications

  • Bore x Stroke: 3.88” x 3.41”
  • Displacement: 242 (4.0L)
  • Compression Ratio: 8.8:1
  • Torque: 220 ft. -lbs. at 4,000 rpm

Engine Performance

Car enthusiasts know this engine for its smooth power delivery and performance. It delivers abundant torque for acceleration and outstanding performance in daily driving conditions. This engine has a high compression ratio that contributes to improved fuel efficiency. The engine is equipped with a wet sump lubrication system. It circulates engine oil throughout the engine’s internal components. This system ensures proper lubrication and reduces wear and tear. 

Durability and Reliability

We knew the AMC 4.0-liter engine for its durability and reliability. Manufacturers used high-quality material in their construction and underwent rigorous testing. It ensures its reliability in various driving conditions. It has a robust design and well-engineered components that work for a longer time. The compression ratio of the engine is 8.5:1. Its high compression ratio enables the engine to extract more fuel from the combustion chamber. It results in improved fuel efficiency and performance.

Fuel & Ignition System

The engine uses a single-barrel carburetor to deliver fuel to the cylinders. Its carburetor is integrated into the intake manifold and provides the correct air and fuel mixture for optimal performance. The ignition system of this engine includes a distributor and spark plugs for each cylinder. The distributor fires the spark plugs and, ensures efficient combustion.

4. Hudson Twin H-Power

Blue colour Hudson Twin H-Power car

Check Out Its Specifications 

  • MSRP: It was $ 2,543 to $3,099
  • Engine: Inline 6 Engine
  • Horsepower: 160 @3800
  • Torque: 260 @ 1800
  • MPG: 14/18
  • Transmission: Hydra-Matic automatic transmission
  • Top Speed: 107 mph


  •  Great Performance
  • Fuel economy
  • Build quality
  • Powerful Engine


  • Needs Regular Maintenance
  • It’s difficult to change its clutch
  • Not Roadworthiness
  • Not improve mileage

The Hudson Twin H-Power is a car with inline-6 engines and a hybrid electric vehicle (HEV). This combines the traditional internal combustion engine with an electric motor. It allows for seamless switching between power sources. It is specially designed to provide this innovative vehicle with exceptional performance and efficiency. Here, it also optimizes fuel efficiency and reduces tailpipe emissions. It also reduces the environmental impact.

Engine Specifications

  • Engine: 5.0-liter, 308-cubic inch, inline six-cylinder
  • Transmission: 3-speed manual, with optional overdrive
  • Compression ratio: 7.2:1
  • Ignition system: Battery ignition
  • Cooling system: Liquid-cooled
  • 0–60 time: 12 seconds

Powerful Performance 

The hybrid power train delivers impressive acceleration and performance. Car drivers can easily achieve fast and responsive acceleration. It makes it suitable for both city and highway driving. Here, it is also an excellent choice for environmentally conscious drivers who demand both performance and fuel efficiency. Its hybrid power train, eco-friendly features, and enhanced safety features make it an excellent choice for families.

Eco-Friendly & Electric Driving

As a hybrid electric vehicle, it helps reduce the carbon footprint. It minimizes fuel consumption and emissions. It also meets strict environmental standards and qualifies for many incentives. Here, the driver can also choose to operate in pure electric mode while using only the electric motor. This offers silent operation and zero-emissions commuting in urban environments.

Enhanced Safety 

The hybrid power train of this car incorporates advanced safety features, such as electronic stability control and traction control. It provides stability and control in various driving conditions, reducing the risk of accidents. There is also regenerative braking, which captures kinetic energy during braking to recharge the batteries. It helps reduce fuel consumption and extends the range.

5. Nissan 26GT/25GT-X RB26DE

Nissan 26GT25GT-X RB26DE car

Check Out Its Specifications 

  • MSRP: It depends on the model
  • Engine: Inline 6 Engine
  • Horsepower: 276 @6800
  • Torque: 260 @4400
  • MPG: NA
  • Transmission: 5-Speed Manual Gearbox
  • Top Speed: NA


  • Powerful Engine
  • Rear-Wheel Drive
  • Elegant Design
  • Spacious Interior


  •  Less Fuel Efficiency
  • Limited Cargo Space
  • High Maintenance Costs
  • Lack of Modern Features

The Nissan 26GT and 25GT-X RB26DE are high-performance engines. This was manufactured between 1989 and 1995, and people know it for being powerful and reliable. It has also become a popular choice for performance fans. There is an aluminum-alloy block and cylinder heads that provide lightweight and durable performance. It has a 2.6-liter displacement and uses a single-overhead camshaft (SOHC) configuration with four valves per cylinder. This produces impressive power output, with a maximum power output of approximately 280 horsepower and 298 horsepower, respectively. The power is derived from a turbocharger, which enhances airflow and increases engine performance.

Engine Specifications

  • Valvetrain: DOHC Belt Drive
  • Bore: 3.386 in
  • Stroke: 2.902 in
  • Compression Ratio: 8.5:1
  • Compression Pressure: 171 psi / 300 rpm
  • Dimensions : It has 34.25 in x 26.18 in x 26.57 in
  • Idle Speed: 950 rpm
  • Ignition Timing: 20 deg BTDC/950 rpm
  • Engine Oil: 7.5W – 30

Drive train and Suspension

The Nissan 26GT and 25GT-X RB26DE engines offer a rear-wheel-drive drivetrain. It perfectly provides optimal traction and handling on the open road. The suspension setup complements the performance characteristics of the engine. It offers a smooth and comfortable ride. There are various transmission options to pair with these engines, including a manual gearbox and an automatic transmission. Its manual transmission offered smooth gear changes and precise control. The automatic transmission offers convenience and ease of use.

Cooling System

These engines have a robust cooling system to handle the eminent power output. It has a liquid-cooled intake manifold, water passages in the cylinder head, and a radiator with an electric fan. Its fuel injection electronic engine management system controls the RB26DE engines. This system ensures optimal engine performance, fuel efficiency, and emissions control. It optimizes engine performance by adjusting the fuel and air mixture using electronic controls.

6. Ford Barra 195

Black colour Ford Barra 195

Check Out Its Specifications 

  • MSRP: NA
  • Engine: Inline 6-cylinder engine
  • Horsepower: 261 @6000
  • Torque: 288 @3250
  • MPG: NA
  • Transmission: Various Options
  • Top Speed: 195


  • Reliable
  • Powerful Engine
  • High horsepower


  • Bulky and heavy
  • Length and height cause issues
  • Limited after-market support

The Ford Barra 195 is a reliable inline 6 engine that was released in the late 1990s. This engine is renowned for its robust design and powerful performance. It has the best fuel efficiency and durability. The Barra 195 remains a popular choice among car lovers. It is also equipped with overhead valves, which allow for efficient fuel combustion and improved engine performance.

Engine Specifications

  • Power: 195 kW (261 hp) at 6000 pm
  • Torque: 391 N⋅m (288 lb⋅ft) at 3250 rpm
  • Compression ratio: 10.3:1
  • Block: Cast iron with 92.26 mm bores and a 99.31 mm stroke
  • Cylinder head: Gravity-cast, aluminum alloy 
  • Camshafts and valvetrain: Double overhead camshafts driven 

Reliability and Durability

People know Ford Barra 195 for its reliability, because of many fewer issues over the years. When you do the proper care and maintenance, then it lasts for hundreds of thousands of miles. The use of high-quality material in this engine and strict quality control measures ensure its durability and reliability.

Performance Features

Its high torque output makes it suitable for various applications, including trucks, SUV’s, and high-performance vehicles. This contains advanced technologies to improve fuel efficiency. It reduces emissions, which makes it an environmentally friendly engine. It has also performed well at high RPMs, which allows for quick acceleration and overtaking maneuvers. Here, it also offers a smooth and relatively quiet driving experience. It also reduces engine noise and vibrations.

7. Toyota 2JZ-GE

orange and white colour Toyota 2JZ-GE car

Check Out Its Specifications 

  • MSRP: $428.67
  • Engine: Inline 6-Cylinder Engine
  • Horsepower: 220
  • Torque: 209
  • MPG: 18/23
  • Transmission: According to the model
  • Top Speed: 331


  • Can hold 1000whp+ with upgraded internals
  • Tightly-packaged, inline configuration
  • Non-interference valvetrain
  • Bulletproof cast-iron block
  • Generated crankshaft


  • Failure-prone timing belt tensioner bracket
  • The oil pump seal can blow out
  • The crank pulley can come apart
  • Poor-flowing cylinder head
  • Failure-prone sequential turbo system

It is also a car with inline 6 cylinder engines that were primarily designed for use within the Toyota Supra and various vehicles. It was developed in the 1980s and is famous for its exceptional power output and overall performance. This engine was notable for its versatility and ability to adapt to different driving conditions.

The 2JZ-GE engine is an overhead-cam (OHC) design with 24 valves. There is use of a cast-iron block and aluminum cylinder heads. Its engine’s bore and stroke dimensions were specifically designed to optimize performance and efficiency. Its cylinder heads were equipped with large valves and aggressively shaped combustion chambers. Here, it allows for better airflow and increased combustion efficiency.

Engine Specifications

  • Engine type: Naturally aspirated
  • Compression ratio: 10:1
  • Capacity: 2997 cc
  • Bore and stroke: 86.0 mm
  • Firing order: 1-5-3-6-2-4 

Power and Torque Output

We know this engine for its impressive power output. It gives a maximum output rating of approximately 280 horsepower and 315 lb-ft of torque. This engine produced its peak torque at low rpm. It makes it well-suited for applications where quick response and smooth acceleration are necessary. It was equipped with an advanced fuel injection system. Here, it optimizes engine performance and provides better fuel delivery. Its fuel injection system was electronically controlled, which allowed for precise fuel metering and ignition timing.

Bore and Stroke

The bore and stroke dimensions of the 2JZ-GE engine provide a balance between performance and efficiency. Here it refers to the inner diameter of the cylinders, which were relatively large. It allows for a larger displacement of air and fuel. Now it represents the distance covered by the piston inside the cylinder. It was relatively short, contributing to the engine’s high rpm capability.

Transmission and Drive train

It was typically mated to a six-speed manual transmission or a sequential manual transmission. It helps to handle the engine’s chief power output and provides smooth gear changes. Here it also had a rev-matching feature, which allowed for smoother downshifts. This is especially true when performing aggressive driving maneuvers.

8. Jaguar XK-6 3.8L S

Jaguar XK-6 3.8L S car

Check Out Its Specifications 

  • MSRP: $14,340
  • Engine: Inline 6 Cyclnder 
  • Horsepower: 400
  • Torque: 450
  • MPG: NA
  • Transmission: 6 Speed Manual Transmission
  • Top Speed: 155


  • Beautiful styling
  • Quick convertible top operation
  • Luxurious cabin
  • Modern dashboard design
  • Classic style body


  • Merely adequate acceleration on regular XK models
  • Its Backseat is for show only
  • No side curtain airbags
  • Not balanced touchscreen
  • Shallow boot

The Jaguar XK-6 3.8L S is a new car with inline 6 engines. It is a luxurious sports coupe that offers many features and specifications for drivers. There is a powerful 3.8-liter engine that offers a thrilling driving experience that combines speed with elegance and refinement.

This car has a six-cylinder engine that produces 265 horsepower and 290 lb-ft of torque. It is mated to a six-speed manual transmission, which allows for smooth gear changes and exhilarating acceleration. With a top speed of over 155 mph, this sports car provides a thrilling driving experience.

Engine Specifications

  • Engine type: 3.8L inline 6-cylinder
  • Bore: 87 mm
  • Stroke: 106 mm
  • Cubic capacity: 3781 cc
  • Compression ratio: 8:1
  • Horsepower: 225 bhp at 5500 rpm
  • Transmission: 5-speed gearbox

Interior and Comfort

The interior of this car provides both comfort and style. Its seats are upholstered in soft leather, providing exceptional comfort for the driver and passengers. The interior is made with high-quality materials, which gives it a luxurious feel. The sports car offers many features to enhance the driving experience, including a premium sound system, Bluetooth connectivity, and a navigation system.

Exterior Design

It has a sleek and aerodynamic exterior design, which gives it a unique presence on the road. The sports car features a large grille, aggressive air intake, and muscular lines, giving it a sporty and aggressive appearance. It has alloy wheels and high-performance tires, which ensure optimal traction and handling on both dry and wet surfaces.

Safety and Technology

Safety is a crucial aspect of the Jaguar XK-6 3.8L S. The sports car has advanced safety features such as front seat airbags. It has antilock brakes, Whiplash-reducing front seats, and front and rear parking sensors. There is also traction control, electronic stability control, lane departure warning, and many other features.

9. BMW S54

Black colour BMW S54_11zon car

Check Out Its Specifications 

  • MSRP: $ 55,700
  • Engine: Inline 6 Engine
  • Horsepower: 338 @ 7900
  • Torque: 269 @4900
  • MPG: 220-230 miles
  • Transmission: Two Options
  • Top Speed: 29 mph


  • Special motor
  • Good sound with the right exhaust
  • Fairly easy to swap into an e30
  • Less weight than the S52 with a supercharger


  • Less power
  • Low torque
  • More expensive parts and motor
  • It has a lot of maintenance issues

The BMW S54 engine is a masterpiece of German engineering and high-performance motoring. It is also the most reliable car with an inline-6 engine, which we know for its exceptional power and reliability. This engine has been used in BMW vehicles since 2001. The S54 engine is renowned for its ability to produce outstanding performance and torque. This makes it a popular choice for BMW enthusiasts. Car fans know this car for its fuel efficiency and reliability. It is also the best choice for drivers who are looking for a high-performance car.

Engine Specifications

  • Displacement: 3246 in-line 6
  • Bore and stroke: 87 mm x 91 mm
  • Compression ratio: 11.5:1
  • Fuel: Premium unleaded
  • Valve diameter: 35 mm intake, 30.5 mm exhaust
  • Valve lift: 12 mm intake, 12 mm exhaust
  • Engine oil spec: 10w60
  • Engine oil capacity: 5.5 L
  • Digital motor electronics: Siemens MSS54


The BMW S54 engine is renowned for its outstanding performance. It has 333hp and 325Nm of torque. The S54 engine delivers highest horsepower and torque figures. Its engine’s high torque output allows instant acceleration, providing a thrilling driving experience. Its top speed mostly varies because it depends on the specific vehicle. The S54 engine can achieve impressive speeds. The turbochargers enable instant power delivery. It allows drivers to accelerate from a standstill effortlessly.

Engine Components

The S54 engine incorporates many advanced features and components. Its engine pistons can easily handle high engine speeds and intense combustion pressures. The cylinder head is machined to perfection, which optimizes airflow and improves engine performance. It has a Mishimoto radiator which is, known for its superior cooling capabilities. This advanced suspension system improves handling and responsiveness, which enhances the overall driving experience.

 10. Mercedes-Benz M103 and M104

red colour Mercedes-Benz M103 and M104 car

Check Out Its Specifications 

  • MSRP: $ 7,600.00
  • Engine: 3.0-liter straight-6 engine
  • Horsepower: 177 horsepower
  • Torque: 188 lb-ft
  • MPG: 22
  • Transmission: 4 Speed Automatic Transmission
  • Top Speed: 25 mph


  • Long-lived
  • Makes eminent power and torque


  • High-mileage oil consumption on former models
  • The M103 300 engine is underpowered

Mercedes Benz produced Mercedes-Benz M103 and M104 engines which are examples of automotive engines. They used these engines in various Mercedes-Benz models from the 1970s to the 1990s. The M103 engine was first introduced in 1975 and remained in production until 1992, while the M104 engine made its debut in 1986 and was discontinued in 1997. It is a car with inline 6-cylinder engines that is known for its performance.

Engine Specifications

  • Straight-four: 89 mm (3.504 in) cylinder bore, 80.25 mm (3.159 in) complete piston stroke, 1,997 cc (121.9 cu in) accurate displacement
  • Straight-six: 95.5 mm (3.760 in) cylinder bore, 80.25 mm (3.159 in) complete piston stroke, 1,996.99 cc (121.864 cu in) accurate displacement
  • 2.6L: It has 158 horsepower, 162 pound-feet of peak torque, and a 5-speed manual transmission
  • 3.0L: It has 177 horsepower and a single overhead cam (SOHC)


They designed both M103 and M104 engines horizontally opposed six-cylinder engines. This design allows for a compact and well-balanced layout, which improves overall vehicle stability. It has a cylinder configuration of 3.0L and 4.2L, respectively. This configuration provided outstanding balance, smooth operation, and increased torque output. It featured overhead camshafts (OHC), which improved engine performance and efficiency. Here it allows for more precise valve timing, resulting in smoother engine operation and reduced emissions.


These engines were equipped with fuel injection systems, which improved fuel efficiency and provided better performance at high engine speeds. This system, which is electronically controlled, allows for precise fuel delivery. It is packed with emission control systems to meet environmental regulations. These systems included catalytic converters, exhaust gas recirculation, and an oxygen sensor. It offered outstanding performance characteristics. They were known for their smooth operation, strong torque output, and responsive acceleration. 

Most Frequently Asked Questions on Cars With Inline 6 Engines

Q1. Which is better V6 or inline 6?

Ans. Inline 6 engines are considered more balanced and smoother than V6 engines. It is always considered the best engine than V6 engines. Various factors show it is better than other engines. Inline 6 engines have cylinders in a row, while V6 engines have cylinders in a V configuration.

Q2. What SUV has a 6-cylinder engine in 2024?

Ans. Many SUVs in 2024 have 6-cylinder engines. The top SUVs are the 2024 Genesis GV80, the 2024 Toyota Grand Highlander, and the 2024 Acura MDX. Many others have this configuration. These new cars with inline 6 engines also have modern features.

Q3. What are the disadvantages of inline 6 engines?

Ans. There are many disadvantages to an inline 6 engine. One disadvantage is that it can be more expensive to maintain than other types of engines. Another disadvantage is that inline 6 engines are usually heavier than other engines, which can make them less fuel-efficient.

Q4. How long does an inline 6 last?

Ans. Inline 6 engines have varying lifespans depending on different factors. They can last over 250,000 miles or several years without major issues. Proper maintenance is crucial for their longevity. Without it, maintaining these engines becomes challenging.

Q5. Do inline 6 engines sound good?

Ans. Many car enthusiasts believe that inline 6 engines produce more pleasing exhaust notes than V6 engines. Its exhaust ports are on the same side of the engine, which allows the exhaust pulses from each cylinder to be separated. When it is compared to a symphony, with each cylinder contributing to the melody.

At the End

Cars with inline 6 engines have many advantages and disadvantages. The above you can check the most reliable cars with inline 6 engines. It helps you to understand its features and specifications and why people prefer to buy this type of engine. Inline 6 engines are powerful and fuel-efficient, but they are also more expensive to build and maintain than other types of engines. Because the inline 6 engines are also heavier than other engine types and require more space in the chassis. These engines are also less efficient at higher speeds, making them less suitable for high-speed racing.

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