1. Kev tshuaj xyuas ua haujlwm ua ntej siv yog qhov tsim nyog. Nws feem ntau yog nyob ntawm seb cov khoom ib txwm muaj thiab puas. Koj tuaj yeem siv nws tom qab tshuaj xyuas txhua yam.
2. Thaum ua haujlwm ntawm tus kheej hloov kho cov menyuam sawv ntsug, tshuaj xyuas, tshem tawm, ntxuav, thiab lwm yam tsis tuaj yeem ua tiav. Vim tias nws yog qhov txaus ntshai heev, thiab nws yog ib qho yooj yim kom puas lub log ncej.
3. Cov kabmob ntawm kev kho cov menyuam thav duab yuav tsum tau lubricated thiab tshuaj xyuas rau kev puas tsuaj. Yog tias muaj, nws yuav tsum tau hloov lub sijhawm.
4. Kev sib txuas ntawm cov hlau yuav tsum tau them nyiaj mloog rau txhua lub sijhawm. Nws yog qhov tsim nyog los xyuas seb nws puas ruaj khov thiab seb qhov chaw sib cuag tau oxidized lossis kub dhau.