I can not take credit for that thought... I actually had a friend who came out of his house and saw some liquid on the ground near his car... felt of it... smelled it... could not figure out what it was... tasted it... decided it was dog urine...
and then told the story on himself.....LOL

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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