I just meant that because it`s factory fill on Corvette,Porsche,etc,doesn`t make it any better than other oils. It only means that Mobil has $$$$ and paid GM those big bucks to stamp their logo on their oil fill caps. It`s just an average grp III hydrocracked dino oil. It`s no longer a pao gro IV. Google "Mobil 1 Visom" and you`ll find ExxonMobil`s powerpoint presentation where they say they moved from a pao to a hydrocracked dino and did so undercover without letting the consumer know. I don`t think it was supposed to go public,but someone got it and posted it on Google awhile back.