Just brought my suburban back up on Envirosafe Industrial 12a. I can't compare to 12 exactly because I upgraded to a more modern parallel flow condenser in the process and my truck had previously been converted to r134. Cooling at idle is OK. Cooling while going down the road was about 38 degrees at 83 degrees ambient. The pressure does seem to run a little lower with the envirosafe than with 134. I don't think it has the chill to it r12 does, but for the price, can't beat it is my opinion.
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