The two donut symbols are designed to help identify the new FA-4 and CK-4 diesel engine oils. Image: API The American Petroleum Institute is introducing a special Service Symbol Donut designed to help ...
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 ...
If you've ever bought a quart of motor oil for your vehicle, you've likely encountered the letters API somewhere on the label. In fairness, there are a lot of abbreviations, symbols and odd number ...
WASHINGTON, D.C.– The American Petroleum Institute (API) is introducing a new special Service Symbol Donut to help consumers identify the recently approved API FA-4 diesel engine oil. API approved two ...
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