I'm a Pennzoil fan but I don't restrict myself to it exclusively. Never had a problem with Fram either. But heck, I used to change my oil every 2000 miles and I used the inexpensive STP filters at WalMart for years. The only oil I ever purchased that I truly could tell the difference in immediately was Shell Fire & Ice. I purchased a case of it in 1977 for 10 cents a quart from a store going out of business. That was $2.40 plus tax. My fuel consumption went from 29mpg down to 18mpg on the highway and my oil was black by 500 miles. The cans were paper with metal ends and you punched the spout in them. I tried Mobil 1 when it came out but my car leaked with it and it was too expensive to keep up with that. I used the last of the Shell Fire & Ice to purge the synthetic from my car and never purchased either one of them since that experience.