Skip to Content

At Off-Road Handbook, our unwavering dedication to content quality is evident. Prior to publication, each piece of information undergoes a meticulous editorial process, which not only guarantees accuracy but also elevates the overall user experience.

7 Most Reliable Mercedes Engines You Can Rely On- Details

Mercedes has a long-standing tradition of creating some of the most dependable and robust engines in the automotive industry. With a legacy of engineering excellence, these powerhouses have not only stood the test of time but have also set a benchmark for performance and longevity in the world of automobiles.

The most reliable Mercedes engines in the automobile market include:

  • OM-617 3.0 liter Mercedes engine
  • OM-603 3.0 liter Mercedes engine
  • W-210 E-class Mercedes engine
  • W-140 V8 Mercedes engine
  • M-103 2.6 liter Mercedes engine
  • W-124 2.6 liter Mercedes engine
  • M-116 V8 Mercedes engine

In this exploration, I will delve into seven standout Mercedes engines, each with its unique characteristics, making them the top choices for those seeking both power and reliability on the road. Whether you’re a Mercedes enthusiast or simply looking for a dependable vehicle, these engines have proven themselves as enduring powerhouses.

1. OM-617 3.0 Liter Mercedes Engine:

7 Most Reliable Mercedes Engines You Can Rely On- Details

Let’s start with the OM-617 3.0-liter engine. This one’s a legend in the Mercedes world, and I can vouch for its reliability. With an average torque range of 25-185 lb-ft, it’s no surprise that these engines can cover over 600,000 miles.

Mercedes produced over 2 million of these powerhouses in just 17 years, earning them the title of the world's best diesel engine. I've experienced the thrill of covering more than 780,000 miles in one of these engines, and it never missed a beat.

However, it’s essential to note that despite its reliability, some owners have reported higher fuel consumption. While it’s 20% more fuel-efficient, the OM-617’s power and high-performance design may lead to increased fuel usage. Maintenance can be a bit on the pricey side, but it’s a small price to pay for the performance and longevity you get.

Features of OM-617 3.0 Liter Mercedes Engine:

Feature

Description

Manufacturing Company

Mercedes-Benz

Production Years

1974 to 1985

Average Torque Range

25 lb-ft to 185 lb-ft

Highest Reported Mileage

Over 600,000 miles

Average Displacement

3.0 liters

Configuration

Inline-5

Average Horsepower Range

79 hp to 230 hp

Type of Fuel

Diesel Fuel

2. OM-603 3.0 Liter Mercedes Engine:

7 Most Reliable Mercedes Engines You Can Rely On- Details

Driving a vehicle with the OM-603 engine is a testament to the efficiency and reliability of diesel power. With an average torque range of 135 lb-ft to 230 lb-ft, this engine provides ample power for various driving conditions. I’ve found it to be a strong performer.

Owners have reported occasional injector and pump issues. While this can be a concern, I’ve learned that regular maintenance and avoiding clogs can help prevent these problems. It’s essential to remember that injector and pump issues are not unique to this engine and can occur with various diesel engines.

The OM-603 3.0-liter engine has proven that not all diesel engines are a headache to deal with. With its combination of torque and efficiency, it's an excellent choice for those looking for a reliable and fuel-efficient powerplant.

Features of OM-603 3.0L Mercedes Engine:

Feature

Description

Manufacturing Company

Mercedes-Benz

Production Years

1985 to 1999

Average Torque Range

135 lb-ft to 230 lb-ft

Highest Reported Mileage

Up to 210,000 miles

Average Displacement

3.0 liters

Configuration

Inline-6

Average Horsepower Range

80 hp to 110 hp

Type of Fuel

Diesel

3. W-210 E-Class Mercedes Engine:

When it comes to the Mercedes vehicle category, the W-210 E-Class engine stands out as one of the most durable and reliable powerplants. Its combination of robust features and advanced electronics has earned it a reputation as one of the most dependable engines in the Mercedes lineup.

One of the standout features of this engine is its 2.7 CDI diesel variant. With its five cylinders, it’s designed to endure extreme conditions and deliver an impressive 170 horsepower with a torque output of about 370 Nm. This power is not just for show; it’s a testament to the engine’s performance and its ability to handle the demands of the road.

What sets the W-210 E-Class engine apart is its unique and classic pair of manual gearboxes. In previous Mercedes vehicles, engineers often utilized indirect injection, but this engine deploys rail direct injection technology, enhancing both fuel efficiency and power delivery.

However, no engine is without its quirks, and some owners have reported issues with injectors that can occasionally fail to work efficiently. This sensitivity to fuel quality is worth noting.

To maintain the engine’s optimal performance, it’s highly recommended to avoid over-fueling and always opt for premium diesel, ensuring that this high-performing engine keeps running smoothly.

Features of W-210 E-Class Mercedes Engine:

Feature

Description

Manufacturing Company

Mercedes-Benz

Production Years

1995 to 2003

Average Torque Range

370 Nm

Highest Reported Mileage

Varies, but impressive

Average Displacement

2.7 CDI

Configuration

Inline-5

Average Horsepower Range

About 170 horsepower

Type of Fuel

Diesel Fuel

Total Power Output

Approximately 370 Nm (torque)

4. W-140 V8 Mercedes Engine:

7 Most Reliable Mercedes Engines You Can Rely On- Details

The W-140 V8 Mercedes Engine is an engineering marvel introduced in 1980 and refined over the years to become one of Mercedes’ most reliable engines.

I’ve had the pleasure of driving with this engine, and it never fails to impress. Driving a vehicle equipped with the W-140 V8 engine is like experiencing a blend of power and durability.

With a substantial displacement of 4.2 liters, this engine generates an impressive 270 horsepower and approximately 400 Nm of torque. This power output ensures that the engine can perform under various conditions and is a testament to its engineering excellence.

One issue to be aware of is the potential for carbon buildup near the cylinder head and combustion chamber. While this is not unique to this engine, it’s essential to understand that carbon deposits can hinder performance. The buildup of carbon can lead to misfires and decreased engine efficiency.

Features of W-140 V8 Mercedes Engine:

Feature

Description

Manufacturing Company

Mercedes-Benz

Production Years

Introduced in 1980 and evolved

Average Torque Range

Approximately 400 Nm

Highest Reported Mileage

Varies but impressive

Average Displacement

4.2 liters

Configuration

V8

Average Horsepower Range

About 270 horsepower

Type of Fuel

Gasoline

Total Power Output

Approximately 400 Nm (torque)

5. M-103 2.6 Liter Mercedes Engine:

7 Most Reliable Mercedes Engines You Can Rely On- Details

The M-103 2.6 Liter Mercedes Engine is known for its excellent power delivery and reliability. Driving a vehicle equipped with the M-103 2.6 Liter engine is an experience in reliability and power.

With an average torque range of 160 lb-ft to 190 lb-ft, it provides a strong and consistent performance. I've seen this engine reach up to 222,000 miles with ease, which is a testament to its reliability.

However, like any engine, it’s not without its quirks. Some owners have reported problems such as the failure of the timing chain, head gasket issues, and oil filter leaks. Additionally, oil leakage is a common problem in many engines and can affect overall performance.

To ensure this engine continues to deliver its reliable performance, it’s crucial to use high-grade oil and keep a close eye on the condition of engine components.

Paying attention to the condition of valves and camshafts is especially important, as issues in these areas can lead to misfires and the appearance of a check engine light.

Features of M-103 2.6 Liter Mercedes Engine:

Feature

Description

Manufacturing Company

Mercedes-Benz

Production Years

1984 to 1997

Average Torque Range

160 lb-ft to 190 lb-ft

Highest Reported Mileage

Up to 222,000 miles

Average Displacement

2.6 liters

Configuration

Inline-6

Average Horsepower Range

150 hp to 190 hp

Type of Fuel

Gasoline Fuel

6. W-124 2.6 Liter Mercedes Engine:

7 Most Reliable Mercedes Engines You Can Rely On- Details

The W-124 2.6 Liter Mercedes Engine is a reliable and enduring powerplant that has earned its place among Mercedes enthusiasts.

Driving a vehicle with the W-124 2.6 Liter engine is like having a dependable companion on the road. With an average torque range of 160 lb-ft to 190 lb-ft, it offers consistent and reliable power. What truly sets this engine apart is its ability to cover impressive distances, with some owners reporting mileage exceeding 700,000 kilometers.

Nonetheless, no engine is without its challenges. Some owners have reported issues such as failing spark plugs, ignition coils, and oil quality concerns. The problems with spark plugs and ignition coils are common in various engines, not just this one. However, they can lead to misfires and trigger a check engine light.

To maintain the engine’s exceptional performance, it’s important to keep an eye on the condition of components and promptly address any issues. Regular maintenance and using high-quality oil can help keep this engine running smoothly for the long haul.

Features of W-124 2.6 Liter Mercedes Engine:

Feature

Description

Manufacturing Company

Mercedes-Benz

Production Years

1984 to 1997

Average Torque Range

160 lb-ft to 190 lb-ft

Highest Reported Mileage

Up to 700,000 kilometers

Average Displacement

2.6 liters

Configuration

Inline-6

Average Horsepower Range

About 160 horsepower

Type of Fuel

Gasoline Fuel

Total Power Output

About 220 Nm (torque)

7. M-116 V8 Mercedes Engine:

7 Most Reliable Mercedes Engines You Can Rely On- Details

The M-116 V8 Mercedes Engine, introduced between 1969 and 1991, quickly gained the attention of automobile enthusiasts. Driving a vehicle powered by the M-116 V8 engine is like taking a journey back in time to the classic era of automotive engineering.

With displacement options of 3.5 liters, 3.8 liters, and 4.2 liters, this V8 engine packs a punch with an average torque range of 195 lb-ft to 230 lb-ft and an average horsepower range of 155 hp to 230 hp. It's a classic powerhouse that delivers both power and refinement.

One common issue reported by owners is the wear of the camshaft and valves. Excessive usage can lead to valve damage and, in turn, the failure of cylinder heads. Inappropriate valve sealing can cause the engine to misfire. To maintain the engine’s classic performance, it’s crucial to keep a close eye on the condition of valves and camshafts.

Regular maintenance and vigilant inspection of these components can go a long way in preserving the classic appeal and reliability of the M-116 V8 Mercedes Engine.

Feature

Description

Manufacturing Company

Mercedes-Benz

Production Years

1969 to 1991

Average Torque Range

195 lb-ft to 230 lb-ft

Highest Reported Mileage

Data not available

Average Displacement

3.5 liters, 3.8 liters, and 4.2 liters

Configuration

V8

Average Horsepower Range

155 hp to 230 hp

Type of Fuel

Gasoline

Final Thought:

Mercedes has produced a lineup of remarkable engines that balance power, longevity, and reliability. Whether it’s the enduring OM-617, the fuel-efficient OM-603, the robust W-210 E-Class, the powerful W-140 V8, the dependable M-103, the enduring W-124, or the classic M-116 V8, each engine offers unique strengths.

These Mercedes engines not only deliver exceptional performance but also endure the test of time, making them a solid choice for those seeking both power and dependability on the road.

Also Read:

7 Most Reliable Mercedes Engines You Can Rely On- Details
5 Reliable Land Rover Engines You Can Surely Count On
7 Most Reliable Audi Engines You Need to Consider

Frequently Asked Questions (FAQs):

Which Mercedes engines are considered the most reliable ones?

The most reliable engines of Mercedes are as follows:

Engines from the category include:

  • Engine OM617
  • Engine OM651
  • Engine OM606
  • Engine OM648
  • Engine M111

What are the top models of Mercedes Benz which are considered reliable?

The most reliable Mercedes Benz models are as follows:

  • Mercedes Benz E-class model
  • GLC model, C-class model
  • GLK class
  • GLA model

Are engines in Mercedes considered reliable ones?

Yes, the engines in Mercedes are considered reliable ones due to their durable nature. These engines can last longer than usual if appropriately used, such as cleaning inner components like air filters, fuel filters, and changing oil.

Is the engine O617 in Mercedes considered a reliable one?

Yes, the OM617 engine in Mercedes is considered the reliable one as it can cover up to 620,000 miles and is a powerful engine in nature.

What are the significant differences between the engine OM612 and OM647?

The significant differences between the engine OM612 and OM647 include:

  • There is an electronic turbo in OM647, while OM612 has vacuum controlled turbo.
  • The EGR in OM647 is more reliable.
  • It has an O2 sensor in it, which is wideband in nature.