Why does oil “foam” in the crankcase?

When a cold compressor is started, pressure drops rapidly and the temperature of the oil rises. As a result, the solubility of the refrigerant is sharply decreased. There will be a rush of gas out of the oil over a very short period of time. The drop in crankcase pressure causes oil foaming. When this …

Why does oil “foam” in the crankcase? Read More »