Quality issues related to the 3.0L I6 LZ0 turbodiesel Duramax are drawing more and more attention online, and in response, GM has issued a new Service Bulletin.

General Motors has been using Duramax diesel engines in certain workhorse models for nearly a quarter century. The 6.6-liter V8 version which powers Chevy Silverado 2500/3500HD and GMC Sierra Heavy ...