I replaced the water pump at around 150,000K(the same time as the trans re-build) and again at around 400K. At around 300+K the fuel system got the works. Both pumps, fuel distributor and injectors. One of the pumps was screaming, a couple of the injectors were leaking down and the fuel distributor was plain worn out. I should mention that I had to replace the fuel pump mounting bracket hangers twice over the years. They look like miniature exhaust hangers and would stretch out until the pump assembly was nearly resting on the protective cover. The rear axle shafts never needed any attention whatsoever, but the right rear wheel carrier bearing needed replacement at around 300K. I forget how many flex discs I put in but I know it was at least three, maybe four. The rear flex disc went the distance as did the driveshaft center support and bearing. I never touched either one. The catalytic converter was replaced early, at around 100K. I remember this very well. Mercedes Benz warrantied the cat because the car was only three years old. The car was registered in Florida but I still checked the emissions periodically, using N.J. standards. It passed with no trouble right up until the last time I checked it, in late 2004. The fuel tank had to be replaced about four years ago. Although I never pin-pointed the leak, when you opened the trunk the fuel smell was horrendous. I still have one of the keys to this car. I think I'll keep it for good luck.