I am about to attempt this a friends '87 420SEL. I will let you know how it works. Of course his leak down time was all winter while it sat in storage, so the results might not be all that immediately obvious.....
Also I am throwing in ES12A, the environmentally safe synthetic freon. I will be interested to see how cold it i compaired to regular freon, as I am putting it in my cars as well.
Anyone have any experience w/ this stuff?

-Matt-

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress