and, @TD - I think the car's vintage is not really a factor - we see many 126 series Mercs (1984-1990) in so much better condition than very many cars. Also many Merc 123 series (with local plates like KW, KX_, KY_, etc) - and their resale value is pretty high - between 200 and 400k. The 126 series are between 400-800k for a 25 year old car.
I guess with Japanese cars in general the resale value is rather high (e.g. Datsun 1200 pickup, Toyota Landcruiser, Toyota Hilux, Nissan Patrol, Datsun 120Y, etc etc). Of course the rest have as high a resale value like a used Tusker can
With European cars the resale value is low though they are durable (BMW, Mercedes, Peugeot, Landrover mainly) and their parts are mostly genuine.
I think if the vehicle is well engineered to start with, despite some problem areas which SHOULD be fixed with genuine parts and no short cuts on service/maintenance, it should be worth keeping for a few more years.
So we need to know, from those that have experience, what are the main issues?
Sometimes we see negative vehicle reviews because people skimp on maintenance and then give a car a bad name.
This guy is willing to revamp the main parts to the tune of Kshs 80-100k (bearings, CV joints, steering overhaul, tyres, major service, shocks, bushes, etc)