my co-worker has the possibility of having water in her oil. she has a 240dl and some fly-by-night wrenchhead told her it would cost about 850 to replace the head gasket and another 400 if the block is cracked. she ha no clue what these guys are talking about but i told her this is way too expensive. i've looked into the archives and cannot find anything for reasons why water would be in the oil and possibly how much something like this would cost. i wouldn't think it should cost much over 200-250$ any help???