quote:Originally posted by ant:
What is Pennzoil's PureBase, and how does PureBase compare to Chevron's IsoSyn?
Pennzoil's PureBase, which is Group II and Group II+, used to be made at their Excel Paralube refinery, which was a joint venture with Conoco. This was before Shell bought Pennzoil. The hydrocracking and isodewaxing process used at this refinery is licensed from Chevron, so from that standpoint the base oil made there is essentially the same thing as Chevron's IsoSyn. No doubt Pennzoil now gets some of its base oil from Shell, but according to Johnny, they still buy quite a bit from Excel Paralubes, too.