Trans X.
Read instructions as to initial amount... my wagon took two cans...$16 total at the time...
run that a few hundred miles... then switch to half that amount forever...
check my name in archives for my experience with it....
Naturally you want to put in new fluid and new filters if you have any....

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Thanks. I've used trans x in the past, wasn't sure if Lucus was any better.

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'81 300SD