| Aside from all the usual W124 things like head gasket leaks etc just give the rear suspens...
Aside from all the usual W124 things like head gasket leaks etc just give the rear suspension a good work out - it's self levelling so you need to see that it works and works properly.
First of all check the rear struts for any obvious signs of leakage.
With the engine off, load the rear - get a couple of friends to sit in there, then start the engine. The rear should rise to level immediately. If it doesn't then check for leaks at the struts and along the whole sytem. There is no fix for any leaks other than replacement of the broken part and although the work is relatively easy to do the parts are very expensive.
Take it for a drive with the rear loaded and unloaded. There should be no difference in the ride quality. if it feels harsh when it's loaded then the accumulators will probably need replacing, again, it's no big job but the parts are also expensive and to replace them involves removing most of the trim in the load area (same goes for the struts). The accumulators are designed to last for approx 100k miles so check the history to see if they have been done, if not then expect to be replacing them any time soon.
Check for any lateral play on the rear wheels - if it's been used for load carrying there's a good chance the rear wheel ties will need replacing, listen for any clunks and knocks from the suspension under load.
As Wagons go - you won't get much better, they are superb work horses and will run forever if properly maintained. Try and see it's service history or at least the service book full of MB stamps.
Good luck and let us know how you get on
Andy
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