Day: March 11, 2021
General Motors recommends the use of dexos™ approved engine oils for global factory and service fill in spark ignited and diesel engines. Importantly, the brands with dexos approved licenses varies over time. GM’s list of Licensed dexos® brands is available online and updated quarterly, with the most recent update on December 16, 2020.
The results of the tests conducted on the samples of O’Reilly, UltraLub, and Unival show the products meet the SAE J300 specifications for the SAE Viscosity Grade listed on the product labels, and are consistent with the listed API Service Categories.
As seen by the differences in the API SN and SN PLUS samples examined by PQIA, the average of the SN PLUS formulations shows lower calcium and higher magnesium levels than API SN. The same can be seen with the new API SP Service Category, and for the same reason; to protect engines from potentially severe damage due to LSPI.