Impilo yeshelufu yesihlungi sikawoyela ngokuvamile iwunyaka owodwa kuya kwemibili, isebenza kuzihlungi zikawoyela ezingasetshenzisiwe noma ezingahlanganisiwe. Uma isifakiwe futhi isisebenza, impilo yayo yangempela yesevisi izothintwa izici ezihlukahlukene, okuhlanganisa ikhwalithi kawoyela, indawo yokusebenza, nemikhuba yokushayela. Umsebenzi oyinhloko wesihlungi sikawoyela ukuhlunga ukungcola, ama-colloid, namanzi kuwoyela wenjini ukuze kuqinisekiswe ukuhlanzeka kukawoyela, ngaleyo ndlela kunikeze ukuthambisa okusebenzayo nokuvikela injini. Nakuba isihlungi sikawoyela siyingxenye esengozini yenjini yemoto futhi sidinga ukushintshwa njalo, ukuphila kwayo kweshalofu akuholeli ngokuqondile ekuhlulekeni kwesihlungi ngenxa yokuphelelwa yisikhathi. Ukuze ulondoloze ukusebenza kahle kwenjini futhi wandise isikhathi sayo sokuphila, kunconywa ukuthi ushintshe isihlungi sikawoyela njalo ngokuvumelana neziqondiso zomkhiqizi kanye nokugcinwa kwemoto. Ngaphansi kwezimo ezifanele zokugcina, isihlungi samafutha esingavuliwe singagcina impilo yeshalofu ende. Kodwa-ke, uma selisebenza, impilo yeshalofu layo lizothintwa indawo yokusebenza yangempela kanye nezimo. Ngakho-ke, ukuhlolwa okuvamile nokushintshwa kwesihlungi sikawoyela kuyisinyathelo esibalulekile sokugcina ukusebenza kahle kwemoto.
