Add. 15 liter tail gear oil to the rear axle. According to the relevant information, the refueling standard of rear axle tail oil is 15ml, and the conversion unit is multiplied by. 15l ... The automobile tail gear is also called final drive. The correct scientific name should be the final reduction ratio gear. It's in the gearbox. The tail gear usually consists of an intermediate shaft gear and a large plate gear (front drive). When the speed ratio of the tail teeth is changed, the acceleration performance of the car will change. The acceleration performance changes because the torque value of the car increases or decreases, but the horsepower does not increase or decrease relatively on the horsepower tester. This is because the tail tooth only changes the torque value, and I will introduce you to the choice later.