I f 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 ...

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 ...

API approved two new diesel oil standards, FA-4 and CK-4, earlier this year. “API is introducing a diesel engine oil category for use in truck engines designed to meet 2017 model year on-highway ...

Do you find the symbols on a container of motor oil baffling? Even if you understand most of them, you may not know the meaning of the three letters "API." ...