Using Motul 10W50 oil in your Honda Hornet 160R should not cause any significant issues. However, it's important to note that the recommended oil viscosity for the Hornet 160R is 10W30, as specified by Honda. The viscosity rating of an oil determines its flow characteristics at different temperatures.
Using a slightly higher viscosity oil, such as 10W50, may offer some advantages, particularly in warmer climates or for riders who push their bikes hard. The higher viscosity oil can provide better lubrication and protection under extreme operating conditions, such as high temperatures or heavy loads.
This is because thicker oil requires more energy to circulate through the engine.
Cold starts: The "10W" part of the oil's viscosity rating indicates its flow characteristics at lower temperatures. While 10W50 oil should still perform well during cold starts, it may take slightly longer for it to reach optimal operating viscosity compared to a 10W30 oil.
Warranty considerations: If your bike is still under warranty, it's essential to follow the manufacturer's recommended specifications to maintain warranty coverage. Deviating from the recommended oil viscosity could potentially affect warranty claims related to engine issues.
In summary, while using Motul 10W50 oil in your Hornet 160R should not cause immediate harm, it's generally advisable to stick to the manufacturer's recommended oil viscosity, which is 10W30 in this case. If you have concerns or specific requirements for your riding conditions, it's best to consult with a qualified mechanic or contact Honda for further guidance.