Quote:
Originally Posted by dewilson58
Creates sludge faster (than other oils) in engines.
Some say true, some say false.
And maybe they refine it better these days.
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Old penzoil formula 40 plus years ago would foam also. Had friend that used old formula and rarely changed oil. Had SBC and lifter rattle problems. When I took valve covers off I could not see one lifter due to slugging and coking buildup. Penzoil now nowhere near the old formula. Another thing older vehicles with primitive PVC systems and old formulated oils would not reduce internal condensation which in winter months would Cassie oil to get diluted and look milky.