You can get a Re-Build Kit for it.

THEN immediately go through GSXR's Wastegate Swap.

http://www.peachparts.com/shopforum/diesel-discussion/212097-wastegate-actuator-swap-om602-962-a.html

Be Aware @ 200K you might be looking at a Tranny Reman in the future.

Also GSXR's W124 Buying Pre-Inspection tips:

http://www.w124performance.com/docs/mb/articles/124.1x3_buying_tips.txt

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'84 300SD sold
124.128