Nothing has gone wrong with this car so far, only some minor things.
Had to change my glow plugs at 350000km, and a bushing in the steering rack.
This is probably one of the most reliable cars you can buy; build quality is excellent. This car is 20 years old and is very comfortable.
The handling is not really the strong side of this car, but with the Sportline pack the handling is a bit better.
The 2.5 liter normally aspirated diesel is very slow, maybe a bit dangerous when overtaking other cars. It requires thorough and full planning.
The interior is top notch, well almost. The seats are very soft and remind me of a sofa; they wear out very fast too (textile).
Maintenance on these cars is easy, I run Castrol magnatec 5-40W and I change oil and filter every 8000km. This is the most important about these old Benz engines; quality oil and it will run forever.
Too bad Benz build quality is fading...
I'm considering the purchase of '87 with the naturally aspired five cylinder diesel. The price is right since it has over 360.000 Km and as a bonus comes with a spare engine (2.5 diesel exactly like the one in the car). I'm just not sure how much work is involved in changing engines (or how expensive). Any info on the subject would be appreciated.