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R12 is highly destructive to the ozone the new stuff 134(a) is a lot easier on it. I believe there is even something newer out now.
Dave....you are better off retrofitting for 134(a) when you refill. Basically you can just change the seals and you're good to go. 134(a) is about a quarter or less the price of R12.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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