Using a different oil grade than recommended by the manufacturer can have potential implications for your motorcycle's engine. In the case of your Honda Shine, it is generally recommended to follow the manufacturer's guidelines for oil viscosity.
The viscosity of an engine oil refers to its thickness and flow characteristics at different temperatures. The recommended viscosity range, such as 10W-30, provided by the manufacturer is specifically chosen to ensure proper lubrication and optimal engine performance under various operating conditions.
Using a higher viscosity oil, like 20W-50, may lead to the following issues:
Poor Lubrication at Low Temperatures: Higher viscosity oils are thicker, and they may not flow as easily during cold starts. This could lead to inadequate lubrication during initial engine startup, potentially causing increased wear on engine components.
Reduced Fuel Efficiency: Higher viscosity oils create more resistance, which can result in increased friction and decreased fuel efficiency. The engine may have to work harder to overcome the added resistance, leading to reduced mileage.
Increased Heat and Wear: While 20W-50 oil can provide better lubrication at high temperatures, it may not be suitable for the design and tolerances of your Honda Shine engine. It could lead to increased heat buildup and potential wear on engine parts not designed to handle higher viscosity oils.
It's generally recommended to stick to the oil grade specified by the manufacturer to ensure optimal engine performance and longevity. However, if you are facing difficulty in finding the exact recommended oil, it would be better to consult with a Honda authorized service center or a knowledgeable mechanic to get their expert opinion on the best alternative oil grade suitable for temporary use in your specific circumstances.