10 Differences Between LMM Vs LML and Which Is Better?

Diesel engine enthusiasts often get confused between the LMM vs LML engines. Both are popular among truck owners who require heavy-duty performance from their vehicles. There are 10 key differences between the two that can make a significant impact on your driving experience. By understanding these differences, you can better determine which engine suits your specific needs and preferences.

LMM Vs LML [10 Must-Know Differences]:

There are two main versions of the Duramax engine, LMM and LML engines, and they have significant differences in pricing, horsepower, vehicle application, durability, mpg, mph, and longevity.

Vehicle Application of Duramax LMM and LML:

The Duramax LMM engine was introduced in mid-2007 and is used in various GM vehicles, including the Chevrolet Silverado HD, GMC Sierra HD, and Chevrolet Express/GMC Savana vans. The engine features a 6.6-liter displacement and offers up to 365 horsepower and 660 lb-ft of torque. It uses an advanced common-rail fuel injection system that improves fuel efficiency while reducing emissions.

The Duramax LMM engine powers the following GM vehicles:

• Chevrolet Kodiak
• Chevrolet Silverado HD [2007.5-2010]   
• Chevrolet Express
• GMC Topkick
• GMC Savana
• GMC Sierra HD [2007.5-2010]

The Duramax LML engine powers the following GM vehicles:

The Chevrolet Silverado HD and GMC Sierra HD models from 2011-2016 are two of the most popular heavy-duty trucks on the market. Both vehicles boast impressive performance, durability, and reliability, which have made them a go-to choice for drivers who need a truck that can handle tough jobs.

LMM Horsepower Vs. LML Horsepower:

Due to their varying design and technological improvements, the Duramax LMM and LML engines have different horsepower ratings. 

Duramax LMM Horsepower: The Duramax LMM engine, introduced in 2007, is known for its robust performance. It delivers a horsepower rating of approximately 365 horsepower. This power output provided ample strength for heavy-duty trucks and commercial vehicles.

Duramax LML Horsepower: The Duramax LML engine, introduced in 2011 as an upgrade over the LMM, brought several enhancements to improve performance and efficiency. The LML engine offers a higher horsepower rating compared to the LMM engine. It delivers approximately 397 horsepower, providing an increase in power and performance. 

LMM Duramax MPG Vs LML Duramax MPG:

Duramax LMM MPG: The LMM engine can achieve around 20 to 23 MPG on highways. These estimates may vary depending on the vehicle’s weight, aerodynamics, and driving habits. 

Duramax LML MPG: Generally, the LML engine can achieve fuel efficiency ranging from approximately 17 to 20 MPG in city driving. It can provide fuel efficiency of around 22 to 25 MPG on highways. 

4. LMM Duramax 0-60 Vs LML Duramax 0-60:

The acceleration performance, specifically the 0-60 mph time, can vary depending on the vehicle model, weight, transmission, and other factors.

Duramax LMM 0-60 mph: This acceleration performance is respectable for a heavy-duty truck or commercial vehicle equipped with the LMM engine.

Duramax LML 0-60 mph: Exact 0-60 mph times can vary depending on the specific vehicle and its configuration; the LML engine typically provides faster acceleration. 

LMM Duramax Towing Capacity Vs. LML Duramax Towing:

The Duramax LMM diesel engine is an excellent choice as it has a towing capacity of about 13,000 pounds or 5896.7 kilograms.

If you require more pulling power, then the Duramax LML diesel engine might be what you need. With a towing capacity of up to 14,500 pounds or 6,577 kilograms – around 1,500 pounds more than its predecessor – it’s an option worth considering.

LMM Price Vs. LML Price:

The Duramax LMM diesel engine is an excellent choice as it has a towing capacity of about 13,000 pounds or 5896.7 kilograms. If you require more pulling power, then the Duramax LML diesel engine might be what you need. With a towing capacity of up to 14,500 pounds or 6,577 kilograms – around 1,500 pounds more than its predecessor – it’s an option worth considering.

LML Duramax Warranty Vs. LMM Duramax Warranty:

If we focus on GM’s Duramax diesel engines, we can see a difference in warranty periods between the LMM and LML models. The LMM engine provides a 5-year or 100,000-mile warranty, while the newer LML engine offers an extended warranty of 150,000 miles or five years – whichever comes first.

LMM Duramax Longevity Vs. LML Duramax Longevity:

LMM Duramax engines were introduced to upgrade the previous LBZ variant, offering improved performance and emissions control. The longevity of an LMM Duramax engine is influenced by various factors, including maintenance, driving conditions, and the owner’s driving habits.

LML Duramax engines represent the latest iteration of the Duramax diesel engine series, offering advancements in performance, efficiency, and emissions control. An LML Duramax engine’s longevity is influenced by factors such as the LMM variant and some specific considerations.

LMM Torque Specs Vs. LML Torque Specs:

The Duramax LMM and LML engines are commonly used in heavy-duty trucks, offering impressive power and torque figures. The LMM engine provides a maximum of 606 lb-ft or 895 Nm at 1600 RPM, which is an excellent figure for most applications. 

LML engine takes things to the next level, providing up to 765 lb-ft or 1037 Nm at the same RPM. These figures significantly impact acceleration performance, with the LML engine coming out on top. With almost 26% more torque than the LMM engine, drivers can expect faster acceleration when driving vehicles equipped with this powerhouse. 

Max Engine Speed:

The Duramax LMM model has a maximum engine speed of 3250 RPM, while the LML model has a lower maximum engine speed of 3000 RPM. Despite this difference in speed, many experts note that the LML provides more power at a lower RPM. It means that while it may not be able to reach as high speeds as its counterpart, it still packs a punch when it comes to torque and acceleration.

Which is Better, LMM or LML?

Both LMM and LML engines are renowned for their power and performance. However, the LML engine, being the newer iteration, offers certain advancements that may sway your decision.

The LML engine incorporates technological enhancements resulting in increased power, efficiency, and emission control. With advancements in engine management and higher torque figures, the LML engine offers a more refined driving experience.

Final Thoughts:

LMM Vs LML are popular among truck owners who require heavy-duty vehicle performance. The LMM Duramax introduced advancements such as an updated emissions control system and a variable geometry turbocharger. It is known for its reliable performance, strong towing capabilities, and stable power output.

With modifications, it is possible to achieve power levels exceeding 500 HP. And the LML Duramax brought further improvements over the LMM, including increased power and torque output, improved fuel efficiency, and enhanced emissions control. It featured a more efficient exhaust brake system, an upgraded turbocharger, and an improved high-pressure fuel system.

Frequently Asked Questions: