Quote:
Originally Posted by adileo
Agree.
Is it also a myth that once you use synthetic you can’t go back to regular? I assume yes
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I've read the opposite. They say going synthetic on an old dirty conventional oil engine can cause leaks because of the cleaning action synthetic is good at. And I experienced that myself first hand. I bought a O/T car with 200,000 miles and put about 10,000 more miles on it. Then I switched over to Royal Purple and lost a cam seal within 1,000 miles. Bad luck, just a fluke...? I don't know, but that's why I'm hesitant to put synthetic in my flathead.