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April 15, 2021 By Thomas F. Glenn, President PQIAThe Petroleum Quality Institute of America has from time-to-time encountered motor oils containing high levels of a multifunctional oil additive calle … read more

A look at some of the elemental differences between the API SN, SN PLUS and SP Service CategoriesThe API SN PLUS Service Category was introduced as a supplement to the API SN specification in 2018 to … read more

Test Results – UltralubMarch 11, 2021Samples of the following three brands of motor oils were recently examined by PQIA. The results of the tests conducted on the samples show the products meet the SA … read more

Know how to read the labels and what to look for on both the front and back labels of the motor oil you buy, or you may be using product that can cause unsatisfactory performance or damage to your e … read more

OWNER'S MANUAL RECOMMENDATIONSVehicle owner’s manuals give motor oil recommendations based on what works best with the engines made by the company. Choice of viscosity grades is usually provided depen … read more