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Re: AC Seal maintenance

>Nitrite o rings need oil to seal (even the green ones) your supposed to oil
o-ring for ease of installation and proper sealing, the only thing I can
think of that does not need oil is a sealing washer (I dont know if BMW
uses
'em tho). R134a works ok but because it runs at a higher pressure (and
pag
oil doesn't seem to be as good as the mineral oil) some wimpy
compressors
(like the one BMW uses) can't handle it but take a good compressor like
a GM
A6 and  a bigger condenser (to lower the pressure a bit) R134a seems to
work
great. Don't worry tho because there is a ton of R-12 around still.

Yes.......Oil helps the O rings to seat properly during assembly. Oil
does nothing to seal a tightened  fitting and will be washed away by the
refrigerant upon first use.I have not heard any convincing arguments
that prove the sealing O-rings need regular oiling to prevent their
premature failure. O ring failure is uncommon IMHO.
Compressor seal failure is far more prevalent and  there is no
preventative maintenance for this (IMHO again) 
Yes......I agree BMW apparently only designs mediocre AC systems.

>Second: Since when has R134a been determined to be more
detrimental to the atmosphere? And if it is, how to the entire
refridgeration industry and US governament miss this fact when
it was so easily found on the BMW Digest?

I posed the question to nail down the rumor.......

Sincerely,
Henri Baccouche