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Originally Posted by POS
You guys are nuts. You can use Freeze12 as an add-in to your R12 system - that's what it was made for. People do it all the time.
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Well, YOU can if you dare suffer the consequences. Do the math. r134 is not miscible with the mineral oil of r12. Freeze 12 is 80% of the main constituent of r134 - how miscible is that with mineral oil.
Freeze12 and similar products were made as SUBSTITUTES - not 'drop-ins', or 'add-ins' to r12 systems -AND they don't cool as well.