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I'd agree. If they were known to go out, it might be a different story. Those (unlike so many other potential BMW leak sources) seem to be OK.
Keep in mind there's a chance you'll take a good seal out, and put a bad one in / do it incorrectly / not prep the crank correctly and they won't work together, etc. and create a problem that didn't previously exist.
Good thinking on "while you are there", it does often apply. Not sure about this one though.
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