thomas1

thanks for the heads up just went and bought 6 more quarts while it was on sale and added to my customer appreciation card another check. One more and I get the $20 off at autozone....

LexFather

Does it say on the bottle Group III, IV, V?

TunedRX300

Mike, Castrol or other brands do not put it on the label. Some experts who work in the industry did professional tests and confirmed the formulation change on Mobil to Group III and GC remaining at Group IV. These tests can not be done by consumers (so you have to trust them but they seem credible, backed up by end results - UOAs from end users such as Lexmex and me)

LexFather

THank you so much. So skip Mobil 1 and find the Castrol GC. I used Royal Purple last time I think that Group IV right?

Thanks to you and everone, I've learned so much about oil!