The LML is the 2011-2016 variant of the Duramax 6.6L V8 diesel engine family. We have a handful of Duramax LML engine guides and plan to continue adding more insightful, in-depth articles for the LML. Check out our guides like deleting the EGR and the 5 best LML engine upgrades. Scroll down for more Duramax LML content and check back for additional articles in the near future.
The LML engine got a major overhaul in 2011, compared to the previous LMM Duramax engine. It featured nearly 60% freshly designed parts, only leveraging a portion of the previous engine design. Up to this point, all of the previous Duramax’s had some internal weaknesses and common problems with bending rods and cracking pistons. The…
One of the best performance upgrades for the Duramax LML is a 3″ downpipe. A downpipe will help reduce exhaust backpressure, providing good power gains in addition to lower EGTs, faster turbo spool, better gas mileage, and more. Through our performance brand, Boosted Performance, we’ve been making downpipes and performance products for Duramax engines for…
Aside from the DPF filter and other exhaust-related emissions systems, the Duramax LML also has an EGR system. EGR systems have a few components, most notably the EGR cooler, than are prone to failure. Additionally, it’s bad for engine longevity and restricts performance. For both performance and reliability reasons, deleting the LML’s EGR system is…
The Duramax LML got a few new emissions systems that the LMM didn’t have, most namely being the SCR system in conjunction with DEF fluid. Of course, many early model LML’s experienced SCR and DEF problems, resulting in expensive repair bills. While the Duramax emissions systems are good for what they are meant to do…
Five simple bolt-on mods can take the Duramax LML past 500whp and 1000wtq. However, the engine does have some weak points from a tuning perspective that must be addressed if you plan on adding more than just an intake and tune. We are going to cover: ECM and TCM tuning, cold air intakes, exhaust systems,…
A cold air intake is the second best performance modification for a Duramax LML, with the first being tuning. An intake will provide horsepower and torque gains through airflow increases, but will also increase throttle response and turbo spool, and add about 1-2mpg of fuel economy improvements. We’ve been installing intakes on Duramax trucks for…
The LML was the biggest overhaul Duramax had done to the 6.6L diesel, using 60% new parts. It received major changes to the block, rod, pistons, emissions equipment and fueling system. The big engine changes to the block and internal components led to a stronger and more durable engine, but the new fueling system and…
