If you did not have the system flushed.... how do you know how much oil is in the system ?

You did not think the system needed to be pressure tested to check for leaks ?.. like Vstech and I say ... which by the way is Industry Standard procedure... that is all we ever site... industry standard procedure.... Vstech is an HVAC professional ...

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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