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Agreed with silicone lube for rubber seals, you shouldn't use mineral grease for them as it could cause them to swell.
Looks like I've got to change the T/stat on my M3 too, on a recent trip on mostly motorways and with a newly installed display gauge, it was showing coolant temp was only getting to ~60C! (ambient was ~5C). Oil temp wasn't quite getting to the ctr mark.
I'm getting the 2AF9 coolant temp code too.
I assume the 4 O-rings are for the 4 pipes connecting to the t/stat housing?
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