U.S. crude oil futures inched up from post-settlement levels Tuesday after the American Petroleum Institute showed a much larger draw than expected in U.S. weekly crude supplies.

U.S. crude oil futures were little changed from post-settlement levels Tuesday after the American Petroleum Institute reported a fall in domestic crude inventories.

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 ...

It’s show time at last for the producers of motor oils developed through the API Proposed Category 11 process. PC-11 was launched in 2011 to develop specs for a new oil-service category to succeed the ...

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 ...

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 ...