a composition is disclosed which comprises an aryl perfluoropolyether , optionally a halogenated oil , and further optionally a thickening agent . the composition can be used as a lubricant itself or as an additive to an oil or grease lubricant and can withstand temperatures higher than 300 ° c . without decomposition . the halogenated oil can be a perfluoropolyether , a fluorosilicone , a polytrifluorochloroethylene , or combinations of two or more thereof . the thickening agent can be finely divided silica , boron nitride , clay , soap , poly , clay , talc , silica , titanium dioxide , polydimethylsiloxane , polyurea , polyurethane , or combinations of two or more thereof .