It’s an advanced, next-generation engine oil standard focusing on ultra-low viscosity oils for modern engines. When purchasing oil, look for the API Service Symbol "Donut" on the label, which is an ...

January 1, 2027, will be the first license date for two new heavy-duty engine oil categories, if all goes as planned.

The American Petroleum Institute (API) announced progress in the development of its new Proposed Category 12 (PC-12) ...

Amsoil is rolling out its new API service category CJ-4 synthetic 5W-40 premium oil for model year 2007 heavy-duty and pickup truck diesel engines. Amsoil is rolling out its new API service category ...