As with too many M104's you can get a head gasket oil leak. Not that bad (mostly messy oil leak) but the replacement head gasket is AMG specific and VERY pricey. Aside from that, if its standard C class its relatively inexpensive, if its AMG specific, you will pay a premium. Wiring harness is worth a closer look. For a 95 model you have the 4 speed tranny which is MUCH better option in that car than the 5 speed longterm.

Hope this helps,
Lee