Our Duramax category is dedicated to all things Duramax diesel. We have tons of upgrade guides, engine problems, DPF deletes, and everything between for the Duramax 3.0L, L5P, LB7, LBZ, LLY, LML, and LMM diesel engines. Check out some of our content like the best Duramax L5P performance mods and the most common 3.0 Duramax problems. Scroll down for more content or check out our individual Duramax categories for a specific engine.
If you’re looking to add a bit of extra power to your Duramax LB7, a tuner or programmer is hands-down the best bet. Tuning will unlock the biggest horsepower gains for a relatively inexpensive price, making it the best bang-for-your-buck LB7 modification. In addition to adding upwards of 100whp and 150+wtq tuning will provide better…
As the third entry into the Duramax family, GM had learned a few things about how to build a turbo diesel V8. Introduced halfway into the 2006 model year as a replacement for the outgoing LLY Duramax, the LBZ improved on a few notable design defects with the previous model. Additionally, the LBZ existed in…
By the time the 2010s rolled around, the Duramax engine was on its 6th iteration, the LML. As an extension of the LMM engine that introduced heavy emissions regulation technology to the engine, there are quite a few ways to improve on the 2011-2016 LML. That is actually a good thing, as the LML is…
When the GM Duramax LLY was launched halfway through the 2004 model year, it represented a step forward in the Duramax diesel engine family. The LLY took the place of the outgoing LB7 Duramax and improved upon some of the LB7’s shortcomings. While the Duramax LLY was an unquestionable improvement over the LB7, it still…
General Motors/Chevrolet produced the Duramax LLY 6.6L diesel V8 engine from 2004–2006. Depending on the mode, it produced 210–310 horsepower and 520–605 lb-ft of torque. It was the replacement for the LB7 V8 diesel engine, and was soon succeeded by the LBZ V8 diesel engine. While at the time, its 210–310 horsepower figure was decent,…
The Duramax LB7 V8 engine is one of the most popular diesel platforms today. The LB7 lasted from 2001–2004, and was the first Duramax engine GMC released. From the factory, the Duramax LB7 produced 235–300 horsepower and a whopping 500–520 lb-ft of torque. While these were substantial power figures in the early-2000s when GM created…
The Duramax LMM was a monstrous 6.6 liter diesel V8 that General Motors/Chevrolet used in their heavy duty lineup from 2007–2010. Depending on the year and model it was in, the LMM put down 250-365 horsepower and 460–660 lb-ft of torque. Yet, with just a few mods you can seriously transform your truck and make…
From 2007–2010, the General Motors/Chevrolet Duramax LMM was one of the top V8 diesel engines on the market. Powering heavy duty trucks, SUVs, and vans, the Duramax LMM is essentially a Duramax LBZ but with some updated emissions equipment. Depending on the year and model, the Duramax LMM makes 250–365 horsepower and 460–660 lb-ft of…
General Motors released the Duramax LMM 6.6 liter diesel engine midway through the 2007 model year as the successor to the Duramax LBZ. GM mainly introduced the LMM for emissions purposes, as it included a diesel particulate filter (DPF) and other new federally required emissions equipment. While the Duramax LMM makes more power than the…
The LBZ succeeded the LLY engine in 2006 and was short lived, being replaced by the LMM in mid-2007. Some notable changes included an upgraded CP3 fuel pump for higher rail pressure and a lower compression ratio which eliminated issues with connecting rod failure in modified LLY’s. Part of the reason for the short life…
Aside from the DPF filter and other exhaust-related emissions systems, the Duramax LML also has an EGR system. EGR stands for exhaust gas recirculation, which essentially routes exhaust gases back into the engine. EGR systems have a few components, most notably the EGR cooler, than are prone to failure. Additionally, it’s bad for engine longevity….
The 6.6L LMM replaced the LBZ Duramax midway through 2007 due to emissions regulations. One of the big changes to the LMM was the addition of a diesel particulate filter, or DPF system. Alongside the DPF is regeneration cycles that occur to clean the particulate filter and system. While the LMM is actually a very…
