Uma umlingani wakho eshisa ebanda, inkinga yesimo. Kodwa uma i-viscosity kawoyela wakho wokupholisa igxuma igxumele phezulu naphansi, leyo yinkinga yekhwalithi.
Amazinga kawoyela wokupholisa, njenge-ISO VG32, VG46, VG68 kanye ne-VG100, abhekisela ku-viscosity yawo ye-kinematic elinganiswa ku-40°C, ngeyunithi ethi mm²/s. Uma inombolo inkulu, uwoyela ujiyile.
Ukukhetha i-viscosity efanele kufana nokuthola umlingani ofanele — ukufanisa kubaluleke kakhulu. Kumakhompressor amancane, anesivinini esiphezulu, kunconywa i-ISO VG32 noma i-VG46. Amakhompressor amakhulu e-screw ngokuvamile asebenzisa i-ISO VG68. Amakhompressor amakhulu anesivinini esiphansi kanye nezimo zokusebenza ezinezinga lokushisa eliphansi zidinga i-ISO VG100.