Hi all, I am new but hope I might be around for a while. I have a question about purchasing one of these w124 s

1992
400e Black with grey leather interior
180,000 miles (mostly highway)

well taken care of. garaged day and night. exterior in very good shape, normal tiny rock chips on front and headlights. small scratch on door (1inch); interior great as well; no cracks in leather, wood. side pockets pulling away a bit. otherwise fantastic

Everything interior works. even stereo (cd changer OEM) works great. built in radar detector even works.

Same mechanic has taken care of car for 10 years. Took it to him. Seems like very good guy; runs independent merc shop. Very upfront. Good review of car though he kept reminding me that its a lot of mileage and any car with that kind of mileage has some risk. His summary: car been very well kept and serviced; tiny oil leak, tiny trans leak, tiny powersteering leak which he says are pretty typical for car of this age and do not need attention at moment. Needs new belt tensioner ($3-400), new front tires, new radio antenna. Soon will need central exhaust pipe($400). Shifts fine now, no lag on reverse, etc. though at 180k, who knows how much longer its good. Otherwise, everything that needs to by replaced typically has been, including AC, PS, radiator, wiring harness, etc.

the timing chain has been replaced and mechanic says its fine.

I am pretty sure the AC compressor and or condenser has been changed. I have to admit my head swam a bit going through all the repair records and I think I cant read my writing. at least one has been fixed. perhaps both. the ac blower mount and ac clutch also repaired. I think the ac has had some serious work done.

I drive 5-6k a year at present. I LOVE old mercs (used to drive a 1977 300D before I moved out of the country for years and sold it). I am willing and can afford to put away $1200-2000 a year for repairs on average, because, as I see it, gets me a far nicer car than the equivalent new car.

What is a reasonable life-span for these cars?

what should this car be selling for privately, IYO? $4200

THANKS!