How to Remove Excess Refrigerant Oil?

[OLeah]

Adopt the method of repeatedly replacing the new refrigerant to reduce the oil content in the system. Weld open the exhaust pipe of the compressor and pour it out directly. If the refrigerant is excessive, simply release an appropriate amount.

[MacManuel]

Last time my car's A/C cooling performance deteriorated, the mechanic said there was too much refrigerant oil added. To remove the excess oil, the safest method is to go to a professional repair shop where they can use a dedicated recovery machine. They'll first vacuum and recover the refrigerant, then use equipment to separate out the excess oil, before finally performing a precise measured recharge. I once tried using a syringe to extract oil from the low-pressure line myself, but ended up introducing air into the system which caused unstable pressure, costing me more money to repair the lines. Now I understand - this isn't a job where you should try to save money by DIY. A deviation of just 20ml in oil quantity could cause the compressor to fail prematurely. It's much safer to leave it to professional equipment.