Using Motul 20W-40 engine oil instead of the recommended 10W-40 oil for your Suzuki Gixxer SF may have a few consequences. Here's what you should consider:
Viscosity: The "10W" and "20W" numbers in the oil's viscosity rating indicate its flow characteristics at different temperatures. The first number (10W) represents the oil's viscosity at cold temperatures, while the second number (40) represents its viscosity at operating temperatures. Using a higher viscosity oil (20W-40) may result in thicker oil, especially during cold starts, which can affect lubrication and potentially cause increased wear on engine components.
Temperature range: Engine oils are designed to operate within specific temperature ranges. The recommended 10W-40 oil is formulated to provide optimal protection and lubrication within the temperature range your motorcycle engine typically operates in. Using a 20W-40 oil may not provide the same level of protection, especially in extreme temperatures.
While using Motul 20W-40 oil might not cause immediate damage to your bike, it is generally advisable to use the recommended 10W-40 oil to ensure proper lubrication and protect your engine.
If you have already used the 20W-40 oil, it would be best to monitor your bike's performance and observe any potential issues. If you experience any unusual engine noise, decreased performance, or other symptoms, it is recommended to switch to the appropriate 10W-40 oil as soon as possible.
Regarding the duration before switching back to 10W-40 oil, there isn't a specific mileage threshold that can be universally applied. However, it would be prudent to change the oil back to the recommended 10W-40 at the next scheduled oil change or maintenance interval. This will help ensure that the engine receives the appropriate lubrication and protection for its normal operating conditions.
To make an informed decision and get accurate advice tailored to your specific motorcycle model, it is always recommended to consult with a Suzuki authorized service center or a knowledgeable mechanic. They can provide precise recommendations based on their expertise and familiarity with your motorcycle.