Sefa yemafuta isefa yakagadzirirwa kubvisa zvinosvibisa kubva muoiri yeinjini, mafuta ekutakurisa, mafuta ekuzora, kana hydraulic mafuta. Oiri yakachena chete inogona kuve nechokwadi chekuti injini inoshanda inoramba ichienderana. Zvakafanana nefirita yemafuta, iyo sefa yemafuta inogona kuwedzera kushanda kweinjini uye panguva imwechete kuderedza kushandiswa kwemafuta.