ACDelco GM 109326 Original Equipment Motor Oils are designed, engineered, and tested to rigorous standards, and are backed by General Motors. Dexos1 Gen 3 oil is the latest global passenger car engine oil specification from GM. It is designed to meet the enhanced performance needs of today's GM vehicles. Unlicensed products have not gone through GM's rigorous testing process and are not approved or recommended for use in GM vehicles. Gen3 is backwards compatible with previous generations of dexos1, ILSAC GF-6 and API SP engine oils. ACDelco GM Original Equipment parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional.