Originally Posted By: 2k05gt
Originally Posted By: Chris142
The truth is that in 198something somebodys brother knew a guy in his church that ran pennzoil in his 76 Pontiac. This same guy removed his thermostat because 195* is "too hot" so 140* must be better. Same guy never checked or replaced his PCV valve or crankcase breather, his car had an apatite for coolant that nobody on the farm could figure out so he just added water whenever the car would overheat.
He did change the 10w-40 Pennzoil every 3-4 years and the filter every other change regardless if if it needed a filter or not.
One day the poor 455 Pontiac lost the plastic gear on the timing chain and when the pulled the timing cover off they were agast at the sludge build up in the engine.
Since he always ran Pennzoil then the sludge inside the engine could only come from one thing. The oil he used!
This is a true story because I heard it from a guy at work who had a cousin......
The Truth is is that it used to.. It WAS the main cause of sludge. Better Refinery and formula changes made Pennsoil a very good oil today, I am an Old Guy and remember cars packed with blackish brown flaky oil sludge from Quakerstate and Pennzoil back in the 70's and 80's. heck sometimes that [censored] kept some of the engines running back then. I think AMSOIL was the only oil that was synthetic back then, I just asked my Dad about this ( he was a master mechanic)and he remembers they would say that their oil would remove the sludge and that people would put kerosene in the engine to clean out the [censored]. All Oils left deposites, Pennzoil and quakerstate were the worst.
Today I don't think any oils do that.
On the other hand, I know of people that only used Pennzoil and Quaker State back in the 70's and 80's and never had sludge or any other problem. Who was refining PZ and QS's oil back in the 70-80's? I'm just not buying that they caused sludge in the late 70's or 80's anymore than other brands if they ever did.
