General Motors’ proprietary tests required for its Dexos1 Gen 3 passenger car engine oil licensing will be available beginning Sept. 1, said GM Engineering Manager Nathan Siebert during a webinar last week. Gen 3 will replace Dexos1 Gen 2, which debuted in 2017.
In December, GM said the new spec will include all of the engine tests for the ILSAC GF-6 passenger car engine oil specification, with the exception of Sequence IIIH, which will be replaced by the GM oxidation and deposit test. This test will have stricter limits than the Sequence IIIH, as will GM’s requirements for the Sequence VH sludge test. Many Dexos1 Gen 2 test methods will be carried over, including a low-speed pre-ignition test and a test for turbocharger deposits, both at tighter limits.
First available use for the Dexos1 Gen 3 mark will be Sept. 1, 2021
