One-liter four-stroke (4T) motorcycle engine oil with a viscosity grade of 10W-40.

Engine lubricants have two main functions: The first is to reduce friction between moving parts, and the second is to dissipate heat from the engine walls.

Viscosity numbers indicate how thick an oil is. It is represented by 2 numbers: The first, with the letter "W" (Winter), refers to how the oil flows when cold, while the second refers to how the oil flows when hot under engine operating conditions.
The selection of a lubricant and when to change the engine oil should be done meticulously and always according to the information specified by the manufacturer in the user manual.