More gems! These come from just tem minutes of searching, on two other forums:
QUOTE: yes penzoil sucks major! my buddy with a 3.1 when we took it apart to rebuild it the person before him used penzoil and there was like little chuncks of oil in the gaps of the heads.... it looked horrible....
QUOTE: Pennzoil is a parafin based oil, or wax basically. That stuff is totally ghey. My uncle bought a brand new car, changed oil with pennzoil every 2500 miles, and by the time it hit 70k, it was burning more oil than gas. Not to mention when my dad bought the car as a beater, he switched it to normal conventional, and within 6 months, rod bearings were going out. Bought drive like they are 80, so abuse was not to blame.; Coincedence, I don't know, but I learned to stay way far away!
QUOTE: it has wax or somthing in it im not sure but them and pennzoil were bad for vehicles because of that but i think that has changed now
QUOTE: I always used to get Pennzoil for my first couple of oil changes, but then I was told by a Jiffy Lube techie that Pennz gums up your engine really badly
QUOTE: its pensoil (not even worth spelling correctly) and
queerstate that i had always heard and seen was the worst, you can tell when either one of those was used because of all the engine sludge and ----.
QUOTE: looks typical of high milage engines that i've torn down that ran on parfin based oils (quaker state, penzoil)
QUOTE: If you're gonna switch to conventional for your engines sake dont use penzoil. its ----.
QUOTE: cause Pennzoil and Quaker State turn to black mashed potatoes when exposed to heat for any long time. I wont use either even in a lawnmower, but its ok for things like door hinges. However, it is fine to use for oiling down gravel driveways
QUOTE: the engines that people used pensoil in had a lot of sludge built up in them from the high concentration of parifin wax.
QUOTE: From reading around on websites about oil (yes I was bored lol).... I have heard penzoil is parafin based and can cause build up.
QUOTE: i was always told by the old timers that pensoil will sludge up your engine like concrete, and now that is whi i'll never use it. its BAD!!
QUOTE: I've also heard that Pennzoil (and Quaker State) use a paraffin base, and can 'sludge up' your engine.
QUOTE: I haven't toorn down a lot of engines but I can say in the early years I used only Penzoil on one. When I found all the sludge and ---- inside the valve cover, I switched to Castrol and sometimes Valvoline.