Yes, you can use 20W50 grade engine oil in a Royal Enfield 350X motorcycle. The 20W50 grade refers to the viscosity of the oil, which is a measure of its thickness or resistance to flow. In general, a higher viscosity oil, such as 20W50, is suitable for motorcycles that operate in hotter climates or under higher loads.
Royal Enfield motorcycles, including the 350X, typically require an engine oil with a viscosity grade of 15W50 or 20W50, depending on the specific model and usage conditions. The 20W50 grade provides good lubrication and protection for the engine components, especially in warmer weather conditions.
They will have the most accurate information regarding the appropriate oil viscosity and specifications for optimal performance and engine longevity.