I have to say that me and Mercedes-Benz CD service manuals do not mix well.
I am either bline or need some education into the Mercedes-benz way of thinking .
I posted an earlier inquiry on replacing the distributor cap , rotor and o ring on my 1992 300-E M103 engine. I thank all you came to my post to help me out.

This morning I popped in the old CD into my computer to do a quick search to back up any information I needed. I logically looked in the first CD under maintance services even under spark plug replacement. I though the job number was 15 535 ? I could not fine it in both CDs . Were on earth did they list this service?

Bob Geco
1992 W124 300-E M103 engine