The most suitable engine oil for a Ducati Diavel would depend on various factors, including the specific model year and the manufacturer's recommendations. It's crucial to refer to the owner's manual or contact an authorized Ducati dealership for the precise oil specifications.
That being said, Ducati typically recommends using their own line of engine oil, which is formulated to meet the specific requirements of their motorcycles. The recommended oil is often listed in the owner's manual, along with the viscosity grade (such as 10W-40 or 15W-50) and any specific performance standards (such as API or JASO).
Additionally, Ducati may provide specific oil recommendations based on the prevailing climate and riding conditions. It's important to follow these guidelines to ensure optimal performance and engine longevity.
If you don't have access to the owner's manual or are uncertain about the exact oil specifications, I recommend reaching out to a Ducati authorized service center or contacting Ducati directly for accurate and up-to-date information regarding the most suitable engine oil for your specific Ducati Diavel model.