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It's tougher and doesn't tear as easily as RTV. If it was a problem then Honda and Yamaha wouldn't use it on their bike engines. They're split case just like these but in the horizontal plane for the most part vs. vertical plane on these. So these engines are much less forgiving of a poor job of sealing the seam. If some does break off the seam it gets stopped by scavenge pump suction screen, if any gets past the screen it gets chewed up by the pump and trapped by the filter before the oil returns to the tank. You want just enough to make a very small squeeze out.
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