Oil yokupholisa iyinsiza ebalulekile yokuhlanza ama-compressor okupholisa. Kumele isebenze kahle ngaphansi kwezimo ezimbili ezinzima: ukupholisa okuphansi kokuphuma cishe -40℃ kanye nokucindezela okuphezulu okungaphezu kuka 100℃. Ipharamitha yayo yokuvunguza ibalulekile ekunqumeni isimo sokusebenza kanye nezimpilo zesevisi ze-compressor.
Ukunganeleka kwe-viscosity ye-oli yokupholisa kungadala uchungechunge lwezinkinga: okokuqala, ifilimu ye-oli ayikwazi ukuveza ungqimba olusebenzayo lokuvikela ezindaweni zezingxenye ezinemininingwane ezifana nezikhala nezibambo, okuholela ekutheni izingxenye zensimbi zixhumane ngqo. Lokhu kukhuphula izinga lokugqoka ngama-3–5 times futhi kukhuphule umsindo wokusebenza kwemishini ngama-10–15 decibels. Okwesibili, ukwehluleka kokunisela kuzokwandisa ukumelana kokusebenza kwe-compressor, kuholele ekukhuleni kokusetshenziswa kwamandla ngama-8%–12% nokwehla kokusebenza komjikelezo wokupholisa. Ukubonakaliswa okuqondile kufaka phakathi ukuncipha kwamandla okupholisa kanye nesivinini sokupholisa esiphansi. Ukusebenza isikhathi eside ngaphansi kwalezi zimo kuzokwehlisa impilo yesevisi ye-compressor ngama-40%–60%.
Okubuhlungu kakhulu ukuthi uma ukuvunguza kuphansi kakhulu ukuze kukhishwe ukushisa okukhishwa ngesikhathi sokucindezela, izinga lokushisa langaphakathi le-compressor lizohlala likhuphuka. Uma izinga lokushisa lidlula umkhawulo wokubekezelela wezinto zokuhlanza, kuzoholela ekushiseni okukhulu, iphutha elaziwa ngokuthi "ukushisa kwe-compressor", eliholela ngqo ekuphuleni kwe-compressor.
Ngakho-ke, ukukhetha ukuvunguza okufanele kwe-oyela yokupholisa ngezimo zokusebenza kuyisimo esiyinhloko sokwenza uqinisekise ukusebenza okuhle kwehlelo lokupholisa.