Njengengxenye ebalulekile yesistimu yesibaseli senjini, ukusebenza kwesihlungi sikaphethiloli kuthinta ngokuqondile ukusebenza kahle kwenjini nempilo yokuphila. Ukufaneleka kwesihlungi sikaphethiloli kuyehluka kakhulu ngaphansi kwezimo zemvelo ezihlukene, okwenza ukukhetha okufanele isihlungi kubaluleke kakhulu ukuze kuqinisekiswe ukusebenza okuzinzile kwemoto noma okokusebenza.
Ezindaweni zokushisa eziphezulu-ezifana nezingwadule noma izindawo ezishisayo, izihlungi zikaphethiloli kufanele zikwazi ukumelana nokushisa{1}}. Amazinga okushisa aqhubekayo angasheshisa ukuhwamuka kukaphethiloli, akhuphule ukucindezela kwesihlungi sangaphakathi, futhi abangele nokuwohloka kwezimpawu. Ngakho-ke, izihlungi ezifanele{4}}izindawo zokushisa eziphezulu zivame ukwakhiwa ngezinto ezikwazi ukumelana nokushisa{5}}futhi zifaka izakhiwo zangaphakathi ezithuthukisiwe ukuze kuncishiswe ubungozi bokuwohloka kokushisa.
Ezindaweni ezinezinga lokushisa eliphansi-njengalezo ezisezindaweni eziphakeme noma ebusika obubandayo, i-viscosity kaphethiloli iyanda kakhulu, iholela ngisho nasekukhiqizweni, okuthinta ukusebenza kahle kwesihlungi. Kulezi zindawo, izihlungi zikaphethiloli kufanele zakhiwe ngezinto eziqinile{2}}ezinokuqina kwezinga lokushisa okuqinile ukuze kugcinwe ukusebenza kokuhlunga kumazinga okushisa aphansi futhi kunqandwe ukuvaleka kwesici sokuhlunga ngenxa yokuminyana kukaphethiloli. Ezinye izihlungi{4}}eziphezulu zifakwe ngisho namadivayisi okushisa ukuze zimelane nezimo-zezinga lokushisa eliphansi kakhulu. Ezindaweni ezinothuli noma ezinomswakama, njengeziza zokwakha noma izindawo ezisogwini, uphethiloli uqukethe amazinga aphezulu okungcola nomswakama. Lezi zindawo zidinga izihlungi ezinokunemba okuphezulu kokuhlunga kanye nokumelana namanzi ukuze kuvinjelwe izinhlayiya kanye nomswakama ukuthi ungangeni enjinini. Izihlungi{9}eziphezulu zekhwalithi ngokuvamile zisebenzisa izendlalelo eziningi zesihlungi semidiya futhi ziklanywe ngezici zokukhipha amanzi ukuze kunwetshwe impilo yesevisi futhi kuvikelwe injini.
Ngaphezu kwalokho, ezindaweni eziphakeme, umoya omncane unciphisa ukusebenza kahle kwenjini, okudinga ngisho nezidingo eziphakeme zokuhlanzeka kukaphethiloli. Izihlungi ezidizayinelwe ukuphakama okuphezulu zidinga ukusebenza kahle okwengeziwe kokuhlunga okuthuthukisiwe ukuze kuqinisekiswe ukushiswa kukaphethiloli okuphelele kanye nokunciphisa amadiphozithi ekhabhoni nokuguga.
Kafushane, izihlungi zikaphethiloli zifanele indawo ebanzi yendawo, futhi abasebenzisi kufanele bakhethe imodeli efanelekile ngokusekelwe ezimeni zabo zokusebenza eziqondile ukuze baqinisekise ukusebenza kwenjini okuzinzile nokusebenza kahle ngaphansi kwezimo ezihlukahlukene.