When I was younger I heard all of the Pennzoil hatred - even from mechanics and service-writers. my dad's impala toasted a camshaft at 55k miles. it musta been the Pennzoil. my girlfriends olds had crusty stuff on the rockers at 20k miles. once again, it musta been the Pennzoil. there was heavy rumor that Pennzoil contained parafin that would wax and gel up. hey, it all sounded good, right?!?!?
now that I am a little more educated, I have the following to say about Pennzoil:
Consumer Reports tested oil many years back, and Pennzoil was the best-performing dino. Only M1 beat it. (that was the only synthetic tested) I have a friend (my age) who has always used Pennzoil and puts 200k+ miles on his cars.
I've gotta believe that Pennzoil, is, and was always, a top-notch oil. As far as dads impala toasting a camshaft, the 229 did have a batch of soft camshafts, chevy paid for the repair, and who knows what OCI dad used. People used some pretty long OCI's back then!! and apparently now, with the prevalence of leased cars.
I have also caught grief from the grey hairs' by using Quaker State, and others. so... the best response is a nod, and perhaps, "Pennzoil's new formula is a top-rated product according to used oil analysis reports posted at the BITOG site - and people are using it with great success in their cars.