For Harley-Davidson motorcycles, the recommended oil is usually a high-quality, mineral-based or synthetic 20W-50 oil. However, it's always essential to consult your specific model's owner's manual or the manufacturer's recommendations for the precise oil type and viscosity required. Different models and years may have slight variations in the recommended oil specifications.
In recent years, Harley-Davidson has also introduced its own line of lubricants called the "Harley-Davidson Genuine Motor Oil" series, which includes both mineral-based and synthetic oils. These oils are formulated specifically for Harley-Davidson motorcycles and meet the company's performance standards. You can find these oils at authorized Harley-Davidson dealerships or online.
Additionally, it's important to consider factors such as climate and riding conditions when selecting the appropriate oil. If you frequently ride in extreme temperatures or engage in heavy-duty riding, you may need to adjust the oil viscosity accordingly. Always refer to the manufacturer's guidelines for the most accurate information to ensure proper lubrication and protection for your Harley-Davidson motorcycle.