Thanks for all the good info! When I got her, I changed all the filters, air, oil, fuel, etc.. Did a diesel purge as well. I'll give the ALDA a shot this weekend and try not to break anything. I'll also check the ball joints.

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'87 300D, w124, 171k
'82 300CD, w123, 200k or so. (sold)
'82 300TD, w123, 168k (sold)
'81 300D, 118k, w123 (sold)