@aaronunknownyoutube: Guys The main function of motor oil is to reduce friction and wear on moving parts and to clean the engine from sludge and varnish (detergents). It also neutralizes acids that originate from fuel and improves the sealing of piston rings, it also cools the engine by carrying heat away from moving parts..Motor oil, engine oil, or engine lubricant is any one of various substances used for the lubrication of internal combustion engines. They typically consist of base oils enhanced with various additives, particularly antiwear additives. #fyp #funny #comedia #funnyvideos #DIY #friend #mechanic #car