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Originally Posted by INF3RN0666
You're right. I can't prove that the oil busted the gasket because the gasket can bust at any given time. But when a gasket busts after 200 Km of changing to synthetic, I would assume that it was the oil conversion. Besides, most people don't replace a gasket before it starts leaking because they're not enthusiasts like you. LIKE I SAID, it's not going to blow your engine, but it will cause a leak if the gaskets are weak. It may not happen on all cars, but it does happen on some. BTW, all the cars you're talking about, with the exception of the first one, don't have high mileage. My eagle vision ran without any need for gasket changes until 450000 Km (not even the head gasket). My impala's engine died at 350000 Km and the gaskets are still fine. My buick is at 200000 and the gaskets are in good condition. So the oldest car you've ever done a conversion on has mileage of 230000 Km. The gaskets in that should be OK. That's most likely why they didn't fail from the conversion. Don't talk about your personal experience and call it fact, just like I'm NOT saying that changing to synthetic will blow your gaskets.
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What I am trying to say is that the oil did not cause your gasket to burst. It was on it's way out. Like you said they can go at any time but they should be replaced after a certain mileage just like things like timing belts. I wouldn't go around just waiting for stuff to break before replacing them since they can cause other problems, more expensive ones and leaky valve cover gaskets can cause fires.
I'm not trying to pass my opinion off as fact. What I am trying to pass off as fact is that synthetic oil will NOT blow a seal or gasket. Perhaps it was coincidence. Perhaps the PCV wasn't working right. Maybe it was because your VC rubber seal was so damn old it was going to burst regardless. Chalk it up to coincidence. My current LeBaron's VC gasket started leaking shortly BEFORE changing to synthetic and it only had 87,000 miles on it.
So, take that for what it's worth.