I never really thought this oil was a group III product and the MSDS seems to bear this out from what I see and how I interpit it . Apparently it's not even a blended group formula ...just one basestock used
http://msds.walmartstores.com/msds/index.html
Just type in Pennzoil and find it in the list .
Also , those hard to come by Castrol Syntec MSDS's are there as well denoting use of at least some Slack Wax and PAO and an ester and of course...group III
http://msds.walmartstores.com/msds/index.html
Just type in Pennzoil and find it in the list .
Also , those hard to come by Castrol Syntec MSDS's are there as well denoting use of at least some Slack Wax and PAO and an ester and of course...group III