I recently changed the plugs on my C36. I used the newer platinum +2's from bosch. After about 1000 miles on the car, I have pulled the platinums and gone back to Bosch Supers (copper, F8DC4). The plaque on the hood says specifically which plugs to use, bosch F8DC0. They also list an equivlent champion plug to use.
My advice is to stick with what the guys at AMG said- bosch copper. The real question is, what is the difference between the F8DC4's and F8DC0? I know the that the zero suffix refers to the electrode being wider, but are there other differences?
1995 C36 AMG