Isihluzo se-oyile sisihluzo esenzelwe ukususa ungcoliseko kwi-oyile ye-injini, i-oyile yothumelo, i-oyile yokuthambisa, okanye i-oyile eqhutywa ngehydraulic. Ioli ecocekileyo kuphela inokuqinisekisa ukuba ukusebenza kwe-injini kuhlala kuhambelana. Ngokufanayo nesihluzi samafutha, isihluzo se-oyile sinokunyusa ukusebenza kwe-injini kwaye kwangaxeshanye sinciphise ukusetyenziswa kwamafutha.