Matsayin farantin kariya na ƙasa na sandar gaba ta motar: 1, don hana ƙananan abubuwa fashewa cikin ɗakin injin yayin tuƙi, haifar da lalacewa ga injin, ko taɓa tukunyar mai na injin lokacin jan ƙasa, yana shafar aikin injin na yau da kullun, yayin da yake kiyaye ɗakin injin tsabta; 2, lokacin da yake tafiya a hankali, yana iya hana ruwa fashewa cikin ɗakin injin, kuma yana hana ɓangaren lantarki jikewa da ruwa da haifar da matsala.