With increasing concern for fuel economy, new diesel-engine technology and diesel engine longevity, the use of diesel engines for passenger cars and light trucks has been increasing in several regions of the world. However, whether in a small car or a large mining truck, injector deposits are common to diesel engines. Today’s Tech Tip reviews the two types of diesel injector deposits: external injector deposits and internal injector deposits, and the AMSOIL products formulated to clean and control them.