Originally Posted by
Goldwing
If my Audis and my Crossfires come with an oem recommendation of Mobil1 0W-40, then that is what I use. They do the engine design and worry about warranty issues, so they should know best.
Ditto, for all the good reasons! Not to mention (but I will) if anything happens to the motor, I don't want to get into a pissin' contest with them about the lifetime powertrain warranty repairs being denied because of a non-approved oil being used.