WARNING.... those ' dust cans' typically from an electronics store...which I made the mistake of assuming was packaged air....( just needed inside photo slide dust removal ) ....
MAY be a refrigerant and FREEZE what you shoot it at... mine also had a faulty trigger...and one should wear gloves when trying one of these cans... mine sprayed this cold stuff on my finger....

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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

no sir - they are not air, its a refrigerant in there and its very important to never shake the can and never use it tilted or sideways and never in long bursts. It can cause you harm.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)