Quote:
Originally Posted by WABOOM
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.
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But your flathead doesn't have lip seals like your modern car (unless it has some modern adaptation, in which the new style seals should be made for use with synthetic).