Gears come in all shapes and sizes; there are spur gears, helical gears, worm, bevel, hypoid sets and more. Lubrication performs no modest part in the purpose and longevity on the gear. STP® Oil Treatment for Gearboxes is designed to lubricate tricky-to-access regions which includes gearboxes, transmissions, differentials, back axles https://erickikiii.worldblogged.com/40200161/about-gearbox-oil-treatment