The diesel engine oil available for your fleet is about to undergo a major change. Two new oil categories, CK-4 and FA-4, have been announced by the American Petroleum Institute (API) and will replace ...

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 ...

Engine oil is the lifeblood of an engine, directly influencing its longevity, efficiency, and performance. Yet many drivers ...

Come December, you’ll see a new API oil classification with lower-viscosity parameters designed to be used in the next generation of fuel-efficient engines. In fact, you’ll see two different oil ...

WASHINGTON, Sept. 26 (UPI) --The American Petroleum Institute said proper classification of crude oil is essential when considering policies for safer rail transit. In May, API said a study published ...