Written by Dan Watson
The LMM Duramax is certainly a step forward in its reduction of emissions into our environment. These controls, however, come at a cost. In Learning to Love the LMM Duramax Emissions System, Joel Paynton looks at what the LMM accomplishes and what it costs in terms of convenience and fuel economy. In this article, I want to take a quick look at what recycled soot does to the engine oil in the LMM and recommend bypass oil filtration as a worthwhile protection for this considerable investment.
Oil bypass filters for large diesel engines are accepted as a necessity and have been recommended by several aftermarket filter companies for many years. As a certified lubrication specialist, I have recommended bypass filtration systems as a solution for many diesel applications, though not for every application. Prior to the LMM, the Duramax engines were capable of dealing with soot. Even if they could benefit from a bypass system, they could certainly get by without one. Not so with the new LMM. I absolutely recommend bypass filtration for this engine.