Lubrication is the use of lubricants to reduce (or control) friction between two frictional surfaces or other forms of surface damage, thereby reducing friction. Because of the two different surface contact, friction arises with each other and produces the following consequences: Wear, noise, high temperature.
If we add a lubricant between the two, we can reduce the occurrence of the above situation. Lubricating oil is also one of the lubricants, it can make the surface of the machine to form an oil film, and between two of the mechanical contact between the parts. So that the activities between the two become easier, smoother, faster, and greatly reduce the damage caused by friction; therefore, if you want the engine to achieve the best lubrication effect, choosing the right lubrication is very important.