Thanks Adam,
I was PROUD to make it through organic chemistry with a C Minus...
So I do not understand what you said..but it sounds good...
Thanks for explaining it ....
I do know that if it is inside my old AC system it is better than many other things....

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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/showthread.php?t=156207&highlight=evaporator

A/C thread

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