Alumaloy promotion youtube videos.... I think the stuff is amazing...

https://www.youtube.com/watch?v=TZ5sD9hQTyw

https://www.youtube.com/watch?v=yJ3uMVkZ2Lc

https://www.youtube.com/watch?v=q1ofGPbOZWU

http://www.harborfreight.com/8-piece-low-temperature-aluminum-welding-rods-44810.html

Of course.... if you work on cars.... it is often nice to get to know your local Welding Supply Shop.... and they are more likely to know the latest stuff and the rules for using it....

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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