First use anything non-petroleum that is made to loosen up sludge, rinse it out and try again.
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Hey! The oil leaks went away. Only a slight weep typical of all cork gaskets.
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I'm glad you made that comment. The way mine is marking its territory, I should clean my road draft tube out- I know it won't fix a real leak, but anything to discourage the oil from looking for the exits could help.
