Most of these Refridgeraters are not the Conventional Kitchen Animal.. They do not typically use a compressor.. The way they generally work is there is a substance in a Tube in the back of them.. There are usually 3 heater types.. Propane Gas, 12V Electric, and AC 110 or 120 Volt Powered.. These Heaters will heat up the substance and cause it to expand.. When the substance is expanded it will get very cold.. Thus cooling the fridge on the inside.. What you are probably thinking of is the Conventional Refrigerators like you would have in your house.. and YES you would be right if it were one of those because it would Damage the Compressor.. All of the oil would be in the lines and not where it should be lubricating the Compressor.. I am not an expert, but I would say it will probably be fine..