Gears are available in all styles and sizes; there are actually spur gears, helical gears, worm, bevel, hypoid sets plus much more. Lubrication plays no tiny component while in the operate and longevity on the products. STP® Oil Treatment for Gearboxes is made to lubricate really hard-to-access places like gearboxes, https://milogvfox.newbigblog.com/40329628/about-gearbox-oil-treatment