The best viscosity of motorcycle oil depends on several factors, including the type of motorcycle, the engine design, the operating conditions, and the manufacturer's recommendations. Viscosity refers to the oil's resistance to flow, and it is usually represented by two numbers, such as 10W-40 or 20W-50. The first number, followed by "W" (which stands for winter), indicates the oil's viscosity at lower temperatures, while the second number represents the viscosity at higher temperatures.
To determine the recommended viscosity for your motorcycle, you should consult the owner's manual or contact the manufacturer. They provide specific guidelines and recommendations for the suitable oil viscosity based on the engine's design and operating conditions. It's important to follow the manufacturer's recommendations to ensure optimal performance, engine protection, and fuel efficiency. Using the wrong viscosity oil could potentially cause issues such as excessive engine wear or poor lubrication.