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I'm looking at the rubber o-ring that fits into an indentation around the threaded extension of the heat exchanger elbow, part 176 in the diagram. It becomes compressed against the flat milled surface of the head as I tighten it down. There's no potential for a crush washer beneath the end of the threaded part of the elbow, but I can imagine the possibility of placing one around the threads. But this is what Mercedes gave me--the rubber o-ring, which is colored with a sort of gun-metal finish. The part number matches the EPC, too. Still seems a little strange, but it wouldn't be the first time I thought something was a little odd on this car.
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Rob
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