Mine has 166k - 1998' 2 owners before me, last one a Merc mechanic from the garage who looked after it after it 2001, who followed a far more thorough service schedule than Merc recommends, and it runs perfectly.
I bought it subject to an inspection from my merc mechanic who looks after a few C43's and has has a C280 himself. He says the engines if maintained go on forever, it's the bodywork and gearbox you need to look out for.
I paid 2k for it, drove straight to him, had new discs and pads all round fitted, new drag link, fuel filter, diff seal, full service with fluid changes, breathers done, and a few minor bits like air con re gas.
Result is I am in for about 3500k, but know the car is good.
I could have paid a lot more for a lower mileage car, that still might have had me paying the same bills.