Might also post this over in the "Featured cars" and "Open Discussion" forums. Lots of guys with these gas w126 cars over there.
Trannies seem to be good for about 200K miles(whatever that is in kilometers). AC/heating air doors/valves/flapper-thingees(whatever) are vacuum operated,and tend to get vacuum leaks. Can be a real PITA to trace down and fix.
Beyond that, they're built like tanks
