That stuff must be falling off the back of trucks here lately, my dad just bought 15 cases for all his tractors and pickup for I believe 20 bucks a case, he has been running it in his 99 psd for quite a while now and he said it seems to act happier on that oil and with 320,000 on original long block I would say it is pretty decent, about 75000 miles ago it got new hpop, injectors, and a list of other stuff along with a pretty nasty chip, I believe tw tunes and the truck seems happy and did a oil analysis about 10000 with about 3000 miles on the oil and everything was good I believe.