Not to spark a R12 vs R134a discussion...
When I first got the car, I had it charged with R12. That leaked out about two years later.
So I had another shop charge it up and t hey used Freeze12 and that leaked out within a year. It was pretty cheap to charge up compared to the R12 @ the time....
So, after I reseal it. I'd probably use R12 direct.
Hit Man X, directed me to this kit, which is both R12 and R134a:
https://www.ackits.com/pc/CP3025/vehiclespecific/CP3025+-+1989+%26+Prior+European+Import+System+O-ring+Kit
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