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Leaking rear main seal - sometimes!

I have an issue with a leaking rear main seal.

It's not a lot, but enough to leak a little oil out the top sighthole in the transaxle and from underneath the bellhousing. So oil is being thrown around inside the bellhousing behind the flywheel. It does not affect the clutch, which os dry.

Strange thing is that it comes and goes. It usually appear after a longer drive at highway speeds (130 kph plus). Then, if the car is parked for a week or so I can take the car for a drive and the leak has disappeared!

I'm thinking it's a weak seal, and I will replace it this winter, but could there be other reasons? Maybe crankcase pressure or other?



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