Yes, you can use Motul 20W50 fully synthetic oil for your CB Unicorn 150cc bike. Motul 20W50 is a multi-grade oil that provides good lubrication and protection for motorcycle engines. It is designed to handle the demands of high-performance engines, including those found in motorcycles.
When choosing engine oil for your motorcycle, it's important to consider the manufacturer's recommendations as stated in the owner's manual. The manual typically specifies the recommended viscosity grade and oil type for optimal performance and longevity of the engine.
If the owner's manual of your CB Unicorn 150cc bike allows the use of 20W50 viscosity grade oil, then Motul 20W50 fully synthetic oil can be a suitable choice. However, it's always a good idea to double-check the manual or consult with a trusted mechanic to ensure compatibility and adherence to the manufacturer's guidelines.