My Brother a die hard Pennzoil user that would never use anything else stopped using Pennzoil today after many years in his company fleet of 19 trucks and his personal cars also because the price is just to high instead he is going to buy bulk from Conoco Philips and mobil like we do in our shops...Conoco and mobil is a great oil at a good price...Today he was at wal mart and decided to buy castrol gtx because it was $3.50 cheaper than Pennzoil because of the price rollback... I mentioned Quaker State but he does not like that oil... He is very smart when it comes to oil he does his research and worked for an oil company 12 years ago.. I told him just go another 1000 miles on his oci (he changes it too often at 4000 or so i said go to 5000 but he made up his mind