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 (May 20, 2016) — The American Petroleum Institute (API) is introducing a special “Service Symbol Donut” to help consumers identify the recently approved API FA-4 diesel engine oil. Earlier ...

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 ...