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When changing an auto ac compressor if you put oil in the do just add r134a with no oil?

No. When changing an auto AC compressor, you should add both refrigerant (R134a) and oil.

The type of oil that is used depends on the specifications for your particular vehicle and compressor. For compressor and oil recommendations. It's crucial to follow these specifications to avoid damaging the compressor and other components of the AC system. Mixing different types of refrigerant oils can also cause issues.