Universal Oils

Universal oils are designed for use with both gasoline and diesel engines and provide an operational convenience in mixed engine fleets. These products are identified with combination API category designations such as CK-4/SN. Although such products can be used in Detroit™ engines (provided they satisfy all Detroit™ requirements), their use is not as desirable as lubricants formulated specifically for diesel engines and having API FA-4, CK-4 and CJ-4 designations.