Pennzoil has already completed the ILSAC GF-6 testing protocol for its designated products. The protocol includes eight engine tests, seven of which are new.
When I was just a young pup in the 1960s working on lubes for Shell Research and Development, passenger car motor oils (PCMO) were much simpler and easier to understand. There were only three performance levels: motor light (ML), motor moderate (MM), and motor severe (MS). Auto manufacturers and lube oil marketers worked closely with