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Well to start with head gasket leaks, cylinder head front cover leaks, and engine wiring harnesses cracking due to brittle insulation. Mass airflow sensors, throttle motors, too many things to list really. If it drives nice and no types of fault lights on the dash would be a good start. Should not have the 722.6 transmission, which even if it did to me is not a deal-breaker, it is just a misunderstood transmission, but this has the 722.5 which is not the filled for life trans.
Like any other Benz it depends on how well cared for it has been, so look for a stack of service records. I would be extremely shy around it if there are no records. Find out if there is a long list of owners or just a couple, and if they can name where it has been serviced, these things need to be cared for by people who know what they are doing, not a quick-lube place.
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