Quote:
Originally Posted by charmalu
Synthetic oil won`t cause a leak, if you have old seals and have been using regular oil, the synthetic will clean out the old gunk etc... that may have been plugging up cracks etc.... in the seals.
There are a ton of old wives tales floating around, just grab one you believe in. 
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I have a Jeep engine that has leaked oil three seperate times on synthetic oil. Every time, I switched back to conventional oil at the next oil change and the leaks stopped. I am pretty convinced that synthetic oil will leak where conventional oil will not. If the "cause" of the leaks was "cleaned out old gunk," the conventional oil must have plugged the gaps pretty quickly.