The transition to CL-4 oils is expected to be backward-compatible, but FB-4 use may depend on OEM approvals for specific engines and applications. Tanks and bottles of heavy-duty diesel engine oil ...

The next-gen heavy-duty engine oil standard (PC-12) has been formally approved, announced the American Petroleum Institute, which also introduced the new CL-4 and FB-4 “donut” certification marks ...

It’s an advanced, next-generation engine oil standard focusing on ultra-low viscosity oils for modern engines. When purchasing oil, look for the API Service Symbol "Donut" on the label, which is an ...

The American Petroleum Institute's new diesel engine oil-service categories, API CK-4 and FA-4, will begin appearing in the marketplace on Dec. 1. API has developed two visually different API Service ...