Yakashongedzerwa nesystem yekusefa mweya ine nhanho mbiri uye firita yemafuta ine nhanho dzakawanda, sisitimu iyi yakagadzirirwa zvakananga nzvimbo dzine guruva rakawanda dzakadai semigodhi nematombo ekuchera, zvichiita kuti injini nemidziyo mikuru zvirambe zviripo uye kuve nechokwadi chekuti inoshanda kwenguva refu mumamiriro ezvinhu akaoma.
Kugona kwetangi remafuta kunogona kusangana nezvinodiwa zvekushanda nguva dzose kwemaawa anopfuura gumi, zvichideredza kuwanda kwekuwedzerwa mafuta uye nguva yekushanda. Yakakodzera nzvimbo dzekuvaka dziri kure kure nenzvimbo dzemafuta, kuchera matune, uye zvimwe zviitiko zvekushanda nguva dzose, zvichivandudza kushanda zvakanaka kwekuvaka.