Amfanin kariyar injin:
1, an tsara allon kariya na injin bisa ga nau'ikan nau'ikan na'urorin kariya na injin daban-daban, ƙirar farko ita ce don hana injin da aka naɗe ƙasa, wanda ke haifar da rashin kyawun watsawar zafi na injin;
Na biyu, domin hana lalacewar injin da tasirin hanyar da ba ta daidaita ba ya haifarwa a kan injin yayin tuki, ta hanyar jerin tsare-tsare don tsawaita rayuwar injin, da kuma guje wa lalacewar motar da lalacewar injin ya haifar sakamakon abubuwan waje yayin tafiyar.
3. Bayan yanayin aikin injin ya yi tsauri, lokacin gyara zai ragu sosai. Zagayen gyaran irin wannan samfurin a ƙasashen waje shine kilomita 15,000 a shekara, kuma za a rage shi zuwa kilomita 10,000 a shekara a China, kuma wasu samfuran ma za a rage su zuwa kilomita 5,000 na rabin shekara. Lokacin gyara yana raguwa, kuma farashin gyara yana ƙaruwa sosai.
