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I am not promoting R134a, I am just stating the facts. Find me a new car using R12.
Statistically any component has a chance of failure. The engine may quit, the tranny may not shift tomorrow. If you buy a compressor, new or used, it stands the same chance of failure using R134a or R12. The issue is not the cooling agent, it is the oil in the compressor. If you put the proper oil, ( BTW, I recommend using Ester oil, not Ether ) then the compressor should be as reliable as any other components.
The compressor failure you are referring to likely caused by installers did not purge all the old mineral oil from the compressor with the compressor in situ in the car. In this case, the compressor is out of the car and as long as it is filled with the proper oil, I really do not see any issues.
My 300D is running fine for 2 years with R134a since I bought it. I do not know how long the PO had it converted. We can talk about it until the cows come home but as far as I am concerned, I will continue to use R134a.
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