Originally Posted by T-Stick
I have run various Chevron/Havoline products with good results. If I had a significant fuel mileage dip, a Chevron oil product would be the LAST item I would consider as a possible issue.
The funny thing is there's only a handful of Grp2 and 3 base oil mfgs stateside.. and Chevron's one of the biggies. So there's a good chance that you're (not you per se) non - BP, XOM, SOPUS, ConocoPhillips lube has a Chevron base oil in it. Even Conoco/Chevron have a joint operation in TX & OK mfg stuff like grp4 and 5's. Trade secret stuff aside, there's nothing that Chevron doesn't know about oil that others do....