For our cars that were designed to run on R12, 134a is THE junk refrigerant. Ever notice how you R12 system worked fine for years -only requiring a periodic
recharge and then once you "converted" it to 134A the compressor craps out, hoses start leaking, condenser clogs up, etc.

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'83 SD, 2x '85 SD
You are entitled to your own opinions, you are not entitled to your own facts.