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.
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 a refrigeration system can lead to reduced system efficiency, decreased cooling capacity, and potential damage to components such as the compressor. It can also cause blockages in the system, leading to uneven cooling or system breakdown. Regular maintenance and proper filtration can help prevent the formation of sludge in a refrigeration system.
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
Fridges must be rested after moving to allow the refrigerant to settle back into place. Moving a fridge can cause the refrigerant to become unsettled, which can potentially damage the compressor if the fridge is turned on immediately. Allowing the fridge to rest for a few hours after moving helps prevent this issue.
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.