Motorcycle engines run at higher RPMs and generate more heat than car engines, and they also have different oil circulation systems. Regular car motor oil is not designed to withstand these conditions and can break down over time, causing engine damage.
In addition, motorcycle engines use a wet clutch system, which means that the clutch plates are bathed in oil. Regular car motor oil can cause the clutch plates to slip, leading to decreased performance and even clutch failure.
It is important to use the correct oil in a motorcycle, as specified in the owner's manual. The correct oil will provide the necessary lubrication, cooling, and protection to ensure the engine runs properly and lasts for many miles.