Date registered: Oct 2012
Vehicle: 1987 420 SEL
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Here is what I have found from a night of research:
Parts are available, however major engine components can be hard to find.
Apparently there were both D-Jet and K-Jet engines in 1976, with K-jet being less problematic. (Can anyone verify or expand on this?)
Rust seems to be the number one thing to look for on these as body repairs can cost more than the asking price.
Suspension parts, both front and rear, require service as well as any rubber bushings.
Timing chains can snap starting around 100K, though I'm not sure if this is as common as it is on the 126s (Again, if anyone can verify?)
Gas mileage is around 14mpg average.