thesheep, the timing chain and rails are the only thing that I would replace now. I would just fix other things as they break.

My car has 156k miles and so far I've done this:

Replace air pump.
Replace belt tensioner
Replace distributor rotors and caps
Replace master cylinder
Replace waterpump

I've done other stuff like rountine maintence.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500