The engine oil grade recommended for your Yamaha FZ may vary depending on the specific model and its requirements. Typically, the manufacturer specifies a recommended oil viscosity range for optimal engine performance and protection.
Motul 7100 is a synthetic motorcycle oil designed for high-performance engines. The numbers in the oil grade, such as 10W50 or 10W40, represent the oil's viscosity at different temperatures. The first number (10W) indicates the oil's viscosity at low temperatures, while the second number (50 or 40) represents the viscosity at high temperatures.
Changing the oil grade from 10W50 to 10W40 may affect the oil's flow characteristics at high temperatures. While 10W40 is a common and widely used viscosity grade, it's essential to ensure that it meets the specifications recommended by Yamaha for your specific FZ model. The owner's manual or Yamaha's official guidelines should provide the recommended oil viscosity range.
To maintain optimal engine performance and protection, it's generally advisable to use the oil grade recommended by the manufacturer. If you have any doubts or questions, it's best to consult a Yamaha authorized service center or a qualified motorcycle mechanic who can provide specific advice based on your motorcycle's requirements.