I feel a total dumb ass for asking this but I'm not totally sure....I have a 97 e320 aventgarde, its a straight 6 engine but is it a twin cam? the 24v variety? sounds dumb i know but had a quick look under the bonnet and because of the size of the cam cover I assumed it was but apparently there is a single cam version and now I am starting to doubt myself. Plaes be gentle with your replies as I feel stupid enough asking...