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Oil
Oil in a AC compressor is there so that the mechanical parts don't over heat from friction
To return oil to the compressor.
Oil in the compressor may leak into the refrigeration system, this oil must be allowed to settle back into the compressor, or it may cause a breakdown due to system blockage
The compressor oil
To prevent wear on the compressor.
to lubricate the compressor
I'm in the process studying for my epa test and this is one of the questions and their answer is foaming occurs in the compressor.
Sludge in refrigeration is a combination of water, acid and oil, normally this combination will eat the varnish on the windings of the compressor and short it out.
You need oil in the compressor just as you need oil in your engine. If there is no oil, it will lock up and seize internally. yes it can cause damage to the bearings in the compressor. The unit has oil in it to lube
Oil starvation is one possibility. The refrigerant is what transports the compressor oil through the system - an insufficient amount of refrigerant won't properly transport the oil, and it'll starve the compressor of lubricating oil. And insufficient amount of compressor oil in the first place could also be a cause, especially if you're charging a dry system. If you did add oil, did you spill any on the compressor? Because I've seen that cause what you're describing, as well.
Floc in refrigeration oil is wax that has separated out from oil containing parathene.