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1995 850 turbo sedan - To continue driving it with a leaky rear main seal or not? 850

posted by  KlausC on  Tue Jan 26 13:37 CST 2010
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last visit: Fri Oct 24 10:15 CST 2014
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The RMS does not have an expected life span. It is continually bathed in oil and thus keeps its flexibility. There are 2 reasons the seal will give out. Excessive crankcase pressure and sludge.

We discussed the PCV to death. The sludge problem is different. If the build up of sludge is extreme, the RMS can dry out but nothing happens regarding a leak. Until, you start using synthetic oil... The cleaners in synthetic can and do remove sludge build up, and that then leaves a dry RMS which is no longer sealing.

You indicated that you use regular oil, not synthetic, so there is no reason why we would think that any sludge has been removed. If you think that sludge is the cause, then replacing the RMS will be the complete solution. At least for another 100K miles.

Klaus
--
Proud owner of a 220S. If I had more room, I would have more Volvos.






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