Gen 5 DD Platform Operators Manual For optimal fuel economy, use DFS 93K223 approved API FA-4 engine oil. Synthetic Oils and Additives Synthetic Oils Synthetic oils may be used in Detroit™ Gen 5 Heavy Duty engines provided they are approved by DFS. The use of synthetic oils does not necessarily ensure the extension of the recommended oil drain intervals beyond the limits. Supplemental Additives Lubricants meeting the Detroit™ specifications outlined in this publication already contain a balanced additive treatment. Supplemental additives are generally not necessary and can even be harmful.
These additives may be marketed as either oil treatments or engine treatments, and are discouraged from use in Detroit™ Gen 5 Heavy Duty engines. Repair expenses which result in component malfunctions, or damage attributed to the use of oil additives, are not covered by Detroit™ warranty. How to Clean an Engine How to Clean an Engine Observance of all environmental protection regulations is required. Information on suitable cleaning and protective products is available from any authorized Detroit™ service outlet. All information subject to change without notice. 81 DDC-SVC-MAN-0217 Copyright © 2022 DETROIT DIESEL CORPORATION