not R12, it's R12a. Duracool. Here is the link....
http://www.deepfreezeinc.ca/faq.htm
I vacuumed out he system today. I can't get cans of R134a in Canada.
I use it on a bunch of the farm equipment and such for ac refills... and some of the older vehicles... R134 is almost impossible to get here....

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'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic