The American Petroleum Institute is introducing a special Service Symbol Donut designed to help buyers differentiate between the new API FA-4 and CK-4 service categories for diesel-engine oils. The ...

The American Petroleum Institute is ramping up efforts to educate diesel engine users about the two new diesel engine oil standards it approved earlier this year, API CK-4 and FA-4. Having two ...

When you change oil in your gasoline-powered pickup truck or vehicle, do you take a second to look at the API (American Petroleum Institute) symbol on the container to make sure you’re using the ...

American Petroleum Institute (API) announced the approval of improved performance standards for engine oils that will provide greater protection and fuel efficiency for today’s gasoline-engine-powered ...

The American Petroleum Institute (API), working with engine manufacturers and oil makers, has completed redesigning two new heavy-duty engine oil specifications. Nearly a decade has passed since the ...