Kev txiav txim siab seb cov roj tshuab xav tau kev hloov pauv puas yuav tsum muaj kev ntsuam xyuas dav dav, suav nrog kev tshuaj xyuas qhov muag, kev ntsuas kev hnov lus, cov khoom siv ua haujlwm, thiab lub sijhawm tu lub voj voog. Nov yog cov txheej txheem tshwj xeeb:
Kev Ntsuas Kev Ntsuas thiab Kev Ntsuas Pom Kev Pom Zoo
Xim Hloov: Cov roj tshuab tshiab feem ntau yog pob tshab, daj ntseg daj, lossis amber. Tom qab ib lub sij hawm ntawm kev siv, yog tias cov xim maj mam darkens mus rau tsaus xim av los yog txawm dub, nws yuav yog vim oxidation los yog paug thiab yuav tsum tau muab sau tseg.
Kev Ceeb Toom Tshwj Xeeb: Kev tsaus ntuj tsis tas txhais tau tias yuav tsum tau hloov pauv, tshwj xeeb tshaj yog rau cov roj uas muaj cov tshuaj detergents thiab dispersants. Lawv qhov kev ua kom huv tuaj yeem ua rau cov roj tsaus, uas yog qhov qub.
Cov ntxhiab tsw txawv txav: rub tawm lub dipstick lossis qhib lub hau npog thiab hnov cov roj. Yog hais tias muaj qaub qaub los yog burnt tsw, nws qhia tau hais tias cov roj tau oxidized thiab deteriorated thiab yuav tsum tau hloov tam sim ntawd.
Tactile Test (Finger Rub Method): Siv cov roj siv me me thiab rub nws ntawm koj cov ntiv tes dua:
Cov roj ib txwm: muaj zog lubrication, tsis muaj grainy xav.
Ineffective Oil: Nyuaj, tsis muaj viscosity, pom impurities, qhia tias ineffective additives los yog hnyav contamination, yuav tsum tau hloov.
Txoj Kev Pom Lub Teeb: Tso cov roj rau ntawm lub dipstick thiab tuav nws kom pom lub teeb muaj zog rau kev soj ntsuam:
Yog tias cov roj poob yog qhov tseeb thiab tsis muaj cov teeb meem tshem tawm, nws yog qhov zoo.
Yog hais tias cov hlau shavings los yog cov impurities feem ntau pom, nws qhia tau tias ceev nrooj hnav thiab yuav tsum tau hloov tam sim ntawd.
