I wouldn't run Amsoil in my lawnmower if it was free. The bearing parts in the pic are from a Suburban pinion bearing. The damage to the race is in the one spot. The damage to the bearing carrier goes all the way around. I'm hard pressed to believe the oil in the diff didn't have something to do with the failure when the part is submerged in a bath of said oil. Further, this truck has an aftermarket diff cover that allows the diff to hold almost a gallon of oil to help with heat and lubrication. The diff oil used when the factory oil was serviced out? Amsoil!