Dibbons
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Head to head test: 70 year old oil (still in original can) vs modern formula oil:
Thanks. That was very interesting. And, near the end, it explained why Quaker State oil has, or had, the reputation for sludging up an engine. Looks like the modern stuff may not still have the problem. (But it sure is hard to lose an old time reputation....)
Pennz and QS used to be the same company.Pennzoil used to be the worst, it had may STILL have Parafin (Candle Wax) in it.. I won't use it nor STP
We used Royal Purple in a dirt engine running E100. Using E100 you hqve to jet very rich so there is plenty of all contamination in the oil.Years ago a buddy disassembled a small block Chevy and put most of the parts in the trunk of his Camaro. Another ole boy suggested that he put some oil on the crank to prevent it from rusting.
I watched him open a new bottle of Pennzoil and pour it on the crank. About 2 weeks later we opened the trunk to have a look. The crank looked like he NEVER
poured anything on it ! Not even a hint of oily residue. Fortunately it had not started to rust too bad. It just had a haze of rust in a few places.
I have a friend who is a faithful Quaker State user. He never has had any problems.
Also in 1988 I was invited to the Quaker State hospitality tent at an NHRA national event. Their goal was salvaging their reputation at that time.
Personally I use Rotella, Brad Penn, Amsoil and Royal Purple products. For the record I only used Royal Purple in a max effort Ford engine. The machinist insisted that I use nothing but Royal Purple. Shifted that 302 above 8000 rpm's and never had a problem.
Pennzoil is now owned by Shell.Things change in 50 years.
FCA has been using Pennzoil since 2009.
Wix makes the filters, but to higher specs, especially water retention.