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Charles,
What symptoms do you have that lead you to believe that you must replace the rear main seal? While the board has seen lots of posts regarding 850 seals, I don't think there are many for 1998 and beyond V70s. My 98 V70XC has a "one-a-day" oil drip, and I posted previously asking about the chance that it was the rear main seal. "Chrissij", one of the most authoratitive source on the board, said he never changes these seals on a 98. More likely causes of an oil leak are:
1) leaking turbo oil return line O-ring
2) Old oil cap gasket
3) some other stuff related to 98-specific oil pan leaks
Maybe I have not accurately analyzed all the data, but I am betting my leak is either from #1, #2, or a combination of both.
Good luck.
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