Valvoline VR-1 in everything I own....Mini Van, both work trucks, VR4, Porsche, really old Jeep, Lawn mower, Gator......The list goes on. I do not trust Mobil one at all. I used to and it cost me three engines in three different cars...The rings were the first to go in 2 of them and the lifters and cams in the third. Upon tear down the bearings were toast in all of them. It took some investigating to be convinced, but I wouldn't run it in my go-kart.
.....and VR1 is the closest in name to the VR4!!! Whats not to love?