Yes, 10W40 oil is suitable for the Yamaha FZ-16. The Yamaha FZ-16 is a popular motorcycle model that typically requires engine oil with a viscosity grade of 10W40. The 10W40 viscosity rating indicates the oil's thickness or flow characteristics at different temperatures. The "10W" refers to the oil's flowability during cold starts, while the "40" represents its thickness when the engine is at operating temperature.
Using the recommended viscosity grade, such as 10W40, ensures that the oil provides proper lubrication and protection for the engine components, promoting smooth operation and extending the engine's life. It's always best to consult your motorcycle's owner manual or contact a Yamaha authorized service center to confirm the recommended oil specifications for your specific model and year.