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.
GM launched the LMM in 2007.5, replacing the LBZ due to tighter emissions regulations. To strengthen emissions active regeneration was added alongside a DPF system. As is common with emissions equipment, this led to a new common problem for the Duramax LMM engine. Similar to its predecessor, the LMM has very few actual engine problems….
In order to meet stricter emissions regulations, the LLY replaced the LB7 engine and was the first Duramax to use EGR emissions technology. Unfortunately, the new EGR system was problematic leading to common valve failure. Aside from this addition the new engine received a variable vane turbo and eventually got some block and internal upgrades…
Outside of a number of common but not catastrophic problems the LB7 Duramax is a stout engine with good reliability and performance for its age. While the engine isn’t necessarily built to be tuned to produce massive amounts of power, it does a great job of being a solid stock work truck. With that being…
The LBZ Duramax is, still today, the favorite Duramax of diesel enthusiasts and one of the most sought after engines. The LBZ was upgraded to be able to handle more power than the previous Duramax and to improve reliability. Furthermore, the LBZ has limited emissions equipment, preventing major problems that newer diesel engines face. The…
