It is commonly suggested that one should not keep the oil level on these cars above the middle point between add oil and full oil.....
as it seems to use more oil above that mark .
I don't know why there would be so much difference side to side on your measurement.....
and interestingly.... you might want to check to see if the color of the dipstick handle is the proper one for Your car......just to make sure...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

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