Don't Overload the A/C System with Oil

Too much refrigerant oil can coat the refrigerant, create a thermal barrier, and degrade system performance, especially when the oil is cold and highly viscous. It can also slug the compressor. When you replace a major HVAC component, use an oil reclaimer to measure the amount of oil you get out of it. You'll know precisely how much to put back in based on what you pull out.