No, using synthetic motorbike engine oil should not damage a Harley-Davidson motorcycle. In fact, many Harley-Davidson motorcycles are compatible with synthetic oils and can benefit from their use. Synthetic oils offer several advantages over conventional oils, including improved lubrication, better temperature resistance, reduced friction, and increased engine protection.
Harley-Davidson even offers their own line of synthetic oils, such as the Screamin' Eagle SYN3 Synthetic Motorcycle Lubricant. These oils are specifically formulated to meet the requirements of Harley-Davidson engines.
Consult your motorcycle's owner's manual or reach out to a qualified Harley-Davidson dealer for guidance on the recommended oil for your specific motorcycle.
It's worth noting that Harley-Davidson motorcycles, particularly older models, may have specific maintenance requirements or unique considerations. It's always a good idea to consult the manufacturer or an authorized dealer if you have any concerns or questions about using synthetic oil in your Harley-Davidson motorcycle.