How to Select Lubricating Oil

How To Select Lubricating Oil - Ops - DD5, DD8

Refer to DDC-SVC-BRO-0001 for more information.

Detroit Fluids Specification (DFS) DFS 93K223 (API FA-4) or DFS 93K222 (API CK-4) oils are recommended for use in the engine.

For optimal fuel economy, use DFS 93K223 approved API FA-4 engine oil.

Cold Weather Starting

Notice: Monograde oils should not be used in the engine, regardless of API service classification. Monograde oils gel at lower ambient temperatures, reducing lubricant flow, and do not provide adequate lubricity at higher engine operating temperatures resulting in severe engine damage.

For picking a lubricant for low temperature applications refer to the section "How to Select Lubricating Oil". See DDC-SVC-BRO-0001.

Use of Synthetic Oils

Note: Synthetic oil does not permit extension of recommended oil drain intervals.

Synthetic oils may be used in Detroit™ engines provided they are approved by a DFS. The use of synthetic oils does not necessarily ensure the extension of the recommended oil drain intervals beyond the limits.

Use of 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™ engines.

Engine damage resulting from the use of such materials is not covered by your Detroit™ warranty. Detroit™ will not provide statements beyond this publication relative to their use.

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Parent topic: How to Procedures
Document Number: 0000042611
Manual Publication Date: 2024-01-05
Topic Publication Date: 2023-03-31