Duramax Lml vs L5P: Unveiling the Better Performer

The main difference between duramax lml vs l5p is that l5p is the newer and more powerful model. L5p is better in terms of horsepower, torque, and performance.

Duramax is a reliable and durable engine used in heavy-duty trucks. It has undergone significant improvements over the years. Two of the latest models of the duramax engine are the lml and l5p. While they may look the same, these models have some differences.

The l5p is the latest addition to the duramax engine family and offers more horsepower, torque, and performance than the lml. The l5p engine also features advanced emission controls, improved turbocharger and increased cooling capacity compared to the lml. This article will provide a detailed comparison between duramax lml vs l5p engines, highlighting their similarities, differences, and overall performance of both engines.

Duramax Lml vs L5P: Unveiling the Better Performer

Credit: autotalent.com


Duramax lml and l5p are two types of engines that are widely used in heavy-duty trucks. They both deliver excellent performance, but they have their own unique features. In this blog post, we will discuss the differences between duramax lml vs l5p and help you determine which one is better suited to meet your needs based on their performance profile.

Power Output And Torque Of The Engines

Power output and torque are essential factors that dictate the performance of any engine. Here’s how the two engines compare:

  • Duramax lml is known for its superior torque output, which is rated at 765 lb-ft. However, its power output is limited to 397 horsepower.
  • L5p, on the other hand, boasts of both high power and torque outputs. It delivers 445 horsepower and 910 lb-ft of torque, which is a significant improvement over its predecessor.

Comparison Of Fuel Efficiency And Consumption

Fuel efficiency and consumption rates are among the main concerns of vehicle owners as they contribute significantly to the overall cost of ownership. Here’s how these two engines compare:

  • Duramax lml delivers a decent fuel efficiency rating of 18 miles per gallon (mpg) for highway driving and 13 mpg for city driving.
  • L5p features a revamped fuel injection system that ensures greater fuel efficiency and reduced emissions. It delivers 20 mpg for highway driving and 16 mpg for city driving, thereby outperforming lml in terms of fuel consumption rates.

Emissions Control And Maintenance

Emissions control is a crucial aspect of any engine, given the increasing environmental concerns. Here’s how these two engines compare:

  • Duramax lml complies with all the necessary emission standards, but it requires more maintenance effort and frequent regeneration cycles, which can be an inconvenience for owners.
  • L5p features a more advanced emissions control system, including a diesel particulate filter and selective catalytic reduction, that ensures compliance with the latest emissions standards and requires less maintenance effort.

Both engines have their own unique features and benefits. If you’re looking for a high-torque engine that delivers decent fuel efficiency, then duramax lml is a good choice. However, if you’re after a more powerful and fuel-efficient engine with advanced emissions control, then l5p is the clear winner.


Durability And Longevity Of The Engines

Durability and longevity are essential factors to consider when choosing an engine. Let’s see how duramax lml and l5p stack up.

  • Lml is known for its durability, having a proven track record for extended engine life up to 300,000 miles with proper maintenance.
  • L5p’s new engine design makes it more dependable and durable than previous models. It also has an extended service life of up to 500,000 miles, which is a significant improvement.

Common Problems And Issues Faced By Users

Every engine has its fair share of problems and issues, and duramax lml and l5p are no exception. Here are some common problems that users have reported.

  • Lml’s primary issue is the fuel injector failure. It can cause your engine to stop running or even lead to engine damage if not addressed promptly.
  • L5p’s issues are relatively minor compared to lml’s, with some users reporting def fluid system problems and fuel contamination.

Comparison Of Warranty And After-Sales Support

Warranty and after-sales support are vital factors to consider before purchasing any engine. Let’s see how duramax lml and l5p compare in this area.

  • Lml comes with a 5-year or 100,000-mile warranty, while l5p is covered with a 5-year or 100,000-mile powertrain warranty.
  • After-sales support is also essential, and l5p’s network of certified dealers is more extensive compared to lml, which had limited certified dealers.

Both duramax lml and l5p are reliable engines with their strengths and weaknesses. Based on your specific needs, you should choose the one that suits your requirements the most.


Differences between duramax lml vs l5p and which one is better

Duramax is a high-performance v8 engine manufacturer that specializes in producing diesel engines. Both the lml and l5p are duramax engines, but there are specific differences between the two engines. Let’s take a look at each of the engines’ key features and target markets to help you decide which one is the best fit for your needs.

Target Markets And Specific Use-Cases For The Engines

The target market and use-case for each engine vary based on factors such as horsepower, torque, and the vehicle’s size and capacity.

Duramax Lml

  • The target demographic for lml is those who need a diesel-powered pickup capable of heavy hauling and towing.
  • The lml engine can generate up to 397 horsepower at 3,000 rpm and 765 lb-ft of torque at 1,600 rpm.
  • It’s best suited to vehicles that require a lot of power to maneuver, such as larger pickup trucks, specifically the silverado and sierra models.
  • The lml engine is also commonly used as a workhorse for various industries such as construction, agriculture, and transportation.

Duramax L5P

  • The l5p engine is designed specifically for heavier loads and longer hauls. It generates an impressive 445 horsepower at 2,800 rpm and 910 lb-ft of torque at 1,600 rpm.
  • L5p is the ideal engine for large pickups, specifically those with heavier payloads.
  • It’s also commonly used in heavy-duty pickups such as the chevrolet silverado 2500hd, 3500hd, and gmc sierra 2500hd, 3500hd.

Comparison Of Towing And Hauling Capabilities

One of the most important factors when considering an engine for any vehicle is its capability to tow and haul. Let’s take a look at how the lml and l5p engines stack up.

Duramax Lml

  • The lml engine has a maximum towing capacity of 23,300 pounds and a payload capacity of up to 7,222 pounds.
  • It’s an excellent engine for towing large items such as boats, trailers, and rvs.

Duramax L5P

  • The l5p engine has an outstanding towing capacity of up to 35,500 pounds and a payload capacity of 7,442 pounds.
  • This engine is ideal for towing large fifth-wheel trailers and hauling heavy loads over long distances.

Off-Road And On-Road Applications Of The Engines

The off-road and on-road application of each engine should factor into your decision-making process. Let’s take a look at the lml and l5p’s off-road and on-road capabilities.

Duramax Lml

  • The lml engine excels in off-road environments, making it ideal for off-road enthusiasts.
  • Its stability control system helps the vehicle stay stable on uneven terrain.

Duramax L5P

  • The l5p engine is perfect for on-road applications, such as long-haul trucking and cross-country trips.
  • It provides steady and reliable power for on-road driving, delivering maximum power and torque for fuel-efficient driving.

To conclude, whether you prefer the lml or l5p engine, it’s evident that both engines are valuable and ideal for different purposes. Regardless of which engine you choose, get ready for high-quality performance and reliability.

Customizability & Upgrades

Duramax diesel engines are popular under the hood of many heavy-duty pickups. Among them, two models have gained a considerable reputation: the lml and l5p. Both engines have their strong and weak points, but an essential consideration for many truck owners is their customizability and upgrade options.

So, let’s dive deeper into the differences between duramax lml vs l5p, focusing on the sub-heading: customizability & upgrades.

Modifiability And Compatibility With Aftermarket Parts And Accessories

One of the essential aspects of customizing any engine is to have access to aftermarket parts and accessories. Thankfully, both the lml and l5p allow for various upgrades and modifications. However, some upgrades that work perfectly for one engine may not suitable for the other.

Lml Modifiability And Compatibility

  • Lml has been in production from 2011-2016 and has a considerable following in the aftermarket community.
  • Many suppliers offer performance and aesthetic upgrades for lml from mild to wild conversions.
  • There are many options for custom tuning and piggyback computers to enhance the engine’s efficiency and power output by re-mapping it or heat-wrapping the charge pipes.
  • Lml also has many dpf (diesel particulate filter) delete options, including complete off-road exhaust systems and tuners with custom delete kits.
  • The lml engine’s stock exhaust tends to be restrictive, and upgrading the exhaust system improves the airflow, leading to increased fuel efficiency and more power.

L5P Modifiability And Compatibility

  • The duramax l5p has been in production from 2017 and is still current, limiting aftermarket part and upgrade options.
  • However, the initial enthusiasm of aftermarket suppliers has brought upgrades from some reputable manufacturers.
  • Several manufacturers have claimed additional power, fuel efficiency, and overall improved performance with their upgrades.
  • Installing engine components such as cold air intake, exhaust system, and upgraded fuel injectors, and tuning the engine can provide a significant power gain.

Comparison Of Available Upgrades For The Engines

Now it’s time to examine the available upgrade options for lml vs l5p engines.

Lml Available Upgrades

  • Increased performance with upgraded injectors and aftermarket tuning.
  • Improving the airflow with a high-flow intake and exhaust system.
  • Extensive dpf delete options that eliminate egr and dpfs, allowing for a smoother, cooler and more efficient engine operation.
  • Upgraded turbochargers that usually come with better performance and improved efficiency.

L5P Available Upgrades

  • Upgraded fuel injectors and ecu tuning maps to achieve more horsepower and torque.
  • Improving the airflow by installing a high-flow air intake or cold air intake system.
  • Upgraded exhaust systems that reduce backpressure and provide noticeable noise reduction.
  • Reduced emissions with a high-flow catalytic converter and muffler.

Cost And Ease Of Installation Of Upgrades

The cost and ease of installation of engine upgrades depend on several factors such as the type of upgrade and the skill level required for installation. Let’s have a look at both engines’ upgrade costs and ease of installations.

Lml Upgrade Costs And Ease Of Installation

  • Existing upgrade options make it easier and quicker to find the best upgrades for your budget.
  • Most upgrades are relatively easy to install, even for those with moderate mechanical skills and can be done in a home garage.
  • Dpf delete kits require professional installation to ensure durability, and removing the dpf system is illegal in most civilized countries.

L5P Upgrade Costs And Ease Of Installation

  • Being a relatively new engine, there are few upgrades in the market and not reassuring.
  • The cost of upgrades is expensive since few manufacturers offer l5p upgrade parts.
  • Installing upgrades can be costly as you’ll need a mechanic with advanced knowledge of the engine’s layout and computer systems.

Both duramax lml and l5p provide a great canvas for customization and upgrades. However, lml engines provide customization options that have been fine-tuned to perfection while l5p is a relatively new engine that requires more time for aftermarket suppliers to shake out.

But there is a high possibility that l5p would open up many new options for innovations soon.

Frequently Asked Questions On Differences Between Duramax Lml Vs L5P And Which One Is Better

What Are The Differences Between Duramax Lml Vs L5P?

The basic difference between duramax lml and l5p is the engine power and performance. The l5p engine provides more power, torque, and efficiency than the lml model. The l5p engine has a stronger block and improved variable turbine technology, which produces a higher power output.

How Does Fuel Economy Differ In Lml Vs L5P?

Duramax l5p offers better fuel efficiency than duramax lml, due to the l5p’s redesigned engine. The use of new technology such as a fully electronic control system, advanced injected pump, particulate filter, and variable vane turbocharger provides better fuel economy, with approximately 11% better fuel mileage.

Which Engine Has A Better Towing Capacity In Lml Vs L5P?

Duramax l5p is the better choice for those who need to tow heavy loads. The l5p’s enhanced structure makes it more robust and better for towing than the lml version. With its upgraded turbo design, better engine cooling, and a new assembly process, l5p can pull up to 23,300 pounds.

How Are Emissions Handled Differently In Lml Vs L5P?

Duramax l5p engine uses advanced exhaust gas recirculation (egr), diesel particulate filter (dpf) and selective catalytic reduction (scr) systems to maintain the emission standards, while the duramax lml uses an oxidation catalyst (doc) and a diesel particulate filter (dpf) system, which are not as powerful as l5p.

Which One Is Better, Lml Or L5P Duramax?

When it comes to overall performance and efficiency, duramax l5p is the clear right choice. It’s a more powerful, efficient, and reliable engine, and a perfect choice for heavy-duty vehicles. Lml, on the other hand, pales in comparison, with low power, torque, and fuel efficiency.


After exploring the differences between duramax lml and l5p engines, it is clear that both engines are well-built and offer unique features. While l5p may have more horsepower and torque, lml is a more cost-effective option. Ultimately, the decision of which engine to choose depends on your specific needs and preferences.

Whether you prioritize power, efficiency, or cost, there is a duramax engine that will suit your requirements. However, it is important to note that choosing the right engine is just one part of the equation. Proper maintenance and care will ensure that your duramax engine performs at its best for years to come.

Overall, with its reliability, power, and efficiency, the duramax is a top-choice diesel engine for any truck owner who wants a vehicle that can handle tough jobs with ease.