I use to use this oil when I first started driving in High school and didn't know anything about oil. The lable says "Out performs all leading conventional motor oils" is what sold me on it. I used it in my 1989 Jimmy that had 140,000 miles on it and it seemed to perform well in the engine. The engine was nice and quiet and I drove it for 2 years until I traided it off. I never did a UOA on it and now I wish I did to really see how it performed. Does this oil really out perform all leading conventional motor oils? I was thinking of trying it in my 2002 z28 ls1 if Mobil 1 10w30 does not give me good UOA results. What do you experts really think of this oil? It seems that the local Napa owner loves it and several mechanics I know like it a lot. Thanks!