For all we know right now, M1 10W40 could just be Delvac-1 with a different label.quote:
Originally posted by 427Z06:
I wonder how the M1R 0w30 now fits into the scheme of things? I see it's now off to the side with a separate link. Would the M1 Extended 10w40 make a good substitute for no M1R 10w40? Or are these totally different formulations for totally different purposes?
Obviously the 10W-40 grade is targeted at a segment of the market who wants to move to a top-notch premium synthetic oil, but also subscribes to the 'thicker is better' syndrome. Just look at all the confusion over 0W-20 in Hondas, read the thread on nondetergent dino oils to realize just how uneducated the driving public is with respect to motor oils.