The rear main sel is between the engine and the transmission. There is a hole built for that purpose, to let the oil out should it leak. So the oil drips should be on the ground under the steering column.
To replace the RMS, the transmission needs to be removed - read expensive - and the $40 seal is replaced.
Typical cause of this is crankcase overpressure due to a clogged PCV line or oil seperator box. At idle, if you loosen the oil fill cap without lifting it up and it "dances", you need to fix/replace the PCV system. If it gets worse, your engine will blow out the exhaust cam seals also.
Klaus
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I still miss my 164 and my 854T. Just driving a V70R :)
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