Yes, it is generally recommended to change the motorcycle motor oil viscosity for winter. As temperatures drop during winter, the viscosity of the motor oil can become thicker, which can hinder proper lubrication and increase engine wear. To ensure optimal performance and protection for your motorcycle's engine in cold weather conditions, switching to a lower viscosity oil is often advisable.
Most motorcycle manufacturers provide guidelines in the owner's manual regarding recommended oil viscosities for different temperature ranges. Typically, they will suggest using a lighter weight oil with a lower viscosity for colder temperatures. For example, if you were using a 10W-40 oil during the warmer months, you might switch to a 5W-30 or even a 0W-20 oil for winter.
The "W" in the oil viscosity rating stands for winter, and the number before the "W" indicates the oil's viscosity at colder temperatures. The lower the number, the better the oil will flow in cold weather conditions. However, it's essential to follow the manufacturer's recommendations to ensure compatibility with your motorcycle's engine and to maintain warranty coverage.
If you're uncertain about the appropriate oil viscosity or have specific concerns about your motorcycle's engine, it's always best to consult the owner's manual or reach out to a qualified motorcycle mechanic for guidance.