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 ...

API is trading in the middle of its 52-week range and above its 200-day simple moving average. Price change The price of API shares has increased $0.07 since the market last closed. This is a 1.73% ...