It may not be the cause of the leak, but it can expose leaks that would not have shown up when using conventional oils. The end result is the same for those who did get leaking problems.
Before synthetic=no leak after syn=leak
It doesn't matter what the cause is, the result is an oil leak.
I'm going to have to disagree. I'd much rather see a leak caused/shown to me by switching to synthetics, than let a leak continue to get worse by staying with dino, and then eventually having a more expensive repair from a busted gasket/bad oil supply, or in worst case scenario, a blown engine. Maybe I'm thinking down the wrong track, but switching to synthetic is a smart move any way you look at it.
BTW, switched to Mobil 1 Synthetic at 55k, no problems.
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