The Most Reliable Duramax Diesel Engine, Ranked

Voting rules: Choose the engine you think is the most reliable!

Updated on May 6, 2024 06:55

When shopping for a truck, selecting the right engine is crucial for ensuring longevity and performance, especially when it comes to diesel engines known for their durability and power. Duramax diesel engines have established a reputation in the automotive industry for being robust, but not all models perform the same under various conditions and over time. This site allows you to contribute to real-time rankings by voting for what you believe are the most reliable Duramax Diesel engines. By participating, you help create a valuable resource for others in making informed decisions. Each vote helps potential buyers identify which engines have stood the test of time, according to collective user experience and satisfaction.

What Is the Most Reliable Duramax Diesel Engine?

1

63
votes
LML Duramax

General Motors

The 2011-2016 models are highly reliable, with improved emissions systems and a durable engine block.
The LML Duramax is a diesel engine produced by General Motors and is part of the Duramax Diesel lineup. It was introduced in 2011 and is known for its reliability, power, and fuel efficiency.

Displacement: 6.6L

Number of Cylinders: 8

Horsepower: 397 hp

Torque: 765 lb-ft

Compression Ratio: 16.8:1
2

36
votes
LBZ Duramax

General Motors

Considered by many to be the best Duramax engine ever made, the LBZ is known for its power, durability, and reliability.
The LBZ Duramax is a diesel engine produced by General Motors (GM) for use in their heavy-duty trucks. It belongs to the Duramax Diesel engine family, which is known for its durability, power, and efficiency. The LBZ Duramax is a highly regarded engine variant that introduced several improvements over its predecessors.

Displacement: 6.6 liters

Cylinder Configuration: V8

Horsepower: 360 hp

Torque: 650 lb-ft

Compression Ratio: 16.8:1
3

27
votes
LLY Duramax

General Motors

The LLY engine is known for its longevity and reliability, with some owners reporting over 300,000 miles without major issues.
The LLY Duramax is a Diesel engine produced by General Motors for use in heavy-duty trucks. It is part of the Duramax V8 engine family and was introduced in 2004. The LLY Duramax offers improved performance, efficiency, and reliability compared to its predecessor, the LB7 Duramax. It features advanced technologies to enhance combustion, reduce emissions, and provide better durability.

Engine Type: V8, Turbocharged Diesel

Displacement: 6.6 liters

Horsepower: 310 hp

Torque: 605 lb-ft

Injection System: Common Rail Direct Injection (CRDI)
4

12
votes
LB7 Duramax

General Motors (GM)

The LB7 was the first Duramax engine, and while it had some issues with fuel injectors, a well-maintained LB7 can be very reliable.
The LB7 Duramax engine is a diesel engine that was developed by General Motors (GM) for use in their heavy-duty trucks and vans. It was the first iteration of the Duramax engines produced by GM, and it was introduced in 2001. The LB7 engine quickly gained a reputation for its reliability and performance.

Displacement: 6.6 L (403 cu in)

Horsepower: 235 hp

Torque: 500 lb-ft

Injection System: Direct Injection

Turbocharger: Garrett VGT turbocharger
5

17
votes
L5P Duramax

General Motors (GM)

The latest Duramax engine, the L5P, has impressive power and efficiency, and so far, it has had few reported issues.
The L5P Duramax is a powerful and reliable diesel engine developed by General Motors (GM) for their heavy-duty trucks. It is widely regarded as one of the most reliable Duramax Diesel engines available.

Displacement: 6.6 liters

Configuration: V8

Power Output: 445 horsepower

Torque: 910 lb-ft

Compression Ratio: 16.0:1
6

12
votes
LMM Duramax

General Motors (GM)

The LMM engine is similar to the LBZ, with improved emissions systems, and it is known for its reliability and power.
The LMM Duramax is a highly regarded Duramax Diesel engine known for its reliability and performance. It was developed by General Motors (GM) for use in Chevrolet and GMC trucks.

Displacement: 6.6 liters

Cylinder Configuration: V8

Fuel System: Common Rail Direct Injection (CRDI)

Horsepower: 365 hp

Torque: 660 lb-ft
7

5
votes
Duramax 6.6L V8 Turbo-Diesel

General Motors (GM)

Introduced in the 2017 Chevrolet Silverado and GMC Sierra HD pickups, the new engine is more powerful and efficient than the previous model.
The Duramax 6.6L V8 Turbo-Diesel is a powerful and highly reliable engine known for its exceptional performance and durability. It has been widely used in heavy-duty trucks and commercial vehicles.

Engine Type: V8 Turbo-Diesel

Displacement: 6.6 liters

Horsepower: 445 hp

Torque: 910 lb-ft

Fuel Injection: High-pressure common rail
8

7
votes
Duramax 2.8L Turbo-Diesel

This smaller engine is used in the Chevrolet Colorado and GMC Canyon pickups, and it is known for its reliability and fuel efficiency.
The Duramax 2.8L Turbo-Diesel is a highly reliable engine known for its efficient performance and durability. It is a compact, four-cylinder diesel engine designed primarily for light trucks and SUVs. The engine was developed by General Motors in collaboration with its subsidiary, Isuzu Motors.

Displacement: 2.8 liters

Cylinder Configuration: Inline-4

Fuel Type: Diesel

Turbocharging: Yes

Horsepower: 181 hp
9

8
votes
Isuzu 6H Engine

Isuzu Motors

While not technically a Duramax engine, the Isuzu 6H engine is the predecessor to the Duramax and is known for its reliability and durability.
The Isuzu 6H Engine is a prominent Duramax Diesel engine known for its reliability and performance. It was designed and built by Isuzu Motors, a Japanese automaker with extensive experience in diesel engine manufacturing.

Engine Type: Inline-6

Displacement: 6.6 liters

Power Output: 400 horsepower

Torque: 765 lb-ft

Cylinder Arrangement: Single overhead camshaft, 4 valves per cylinder
10

6
votes
Caterpillar 3126B

Caterpillar Inc.

Another pre-Duramax engine, the Caterpillar 3126B is a highly reliable diesel engine used in some GM medium-duty trucks.
The Caterpillar 3126B is a reliable Duramax Diesel engine known for its robust performance and durability. It was created by Caterpillar Inc., an American machinery and engine manufacturer.

Displacement: 7.2 L

Configuration: Inline 6-cylinder

Fuel System: Electronic unit injection

Power Output: 175-330 horsepower

Torque Output: 420-860 lb-ft

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About this ranking

This is a community-based ranking of the most reliable Duramax Diesel engine. We do our best to provide fair voting, but it is not intended to be exhaustive. So if you notice something or engine is missing, feel free to help improve the ranking!

Statistics

3456 views
181 votes
10 ranked items

Voting Rules

A participant may cast an up or down vote for each engine once every 24 hours. The rank of each engine is then calculated from the weighted sum of all up and down votes.

More information on most reliable duramax diesel engine

Duramax Diesel engines are widely recognized as some of the most reliable engines for heavy-duty trucks. They were first introduced in 2001 as a joint venture between General Motors and Isuzu Motors. Since then, Duramax engines have been powering some of the most popular trucks on the road, including the Chevrolet Silverado and GMC Sierra. The Duramax Diesel engine lineup includes the 6.6L V8, which is currently the most powerful Duramax engine available, as well as the 2.8L four-cylinder and the 3.0L inline-six. These engines are known for their impressive torque and towing capacity, making them a popular choice among truck enthusiasts. When it comes to reliability, the Duramax Diesel engine has a strong track record. Owners have reported minimal issues with these engines, and they are known for their longevity and durability. The engines are also designed with features such as a high-pressure common-rail fuel injection system and a variable geometry turbocharger to help improve efficiency and reduce emissions. Overall, if you're looking for a reliable and powerful diesel engine for your heavy-duty truck, the Duramax Diesel engine is definitely worth considering.