I don't know all of them from memory, but I would speculate that this is the bulletin telling of the new alluminum distributors. They are no longer cast iron as the old ones were. They began to rust. (HMMMMM)

I would replace the injection nozzles and the fuel filter while there.

__________________
Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS