1. Kev tu sab nrauv: Tsis tu ncua so cov khoom siv sab nrauv nrog cov ntaub ntub dej kom tshem tawm cov plua plav thiab av. Ceev faj kom tsis txhob siv cov tshuaj ntxuav corrosive kom tsis txhob ua rau qhov chaw puas.
2. Kev ntxuav sab hauv: Tsis tu ncua ntxuav cov khoom siv sab hauv, nrog rau lub nruas, cov kav dej, thiab cov lim dej. Nco ntsoov tua lub hwj chim thiab tshem tawm cov hlua hluav taws xob ua ntej ntxuav kom muaj kev nyab xeeb.
3. Lubrication: Tsis tu ncua lubricate cov cuab yeej kis tau tus mob thiab bearings kom txo tau hnav thiab suab nrov, thiab txhim kho cov khoom efficiency.
