I assume you have already accomplished the 200 mile break-in maintenance so if you follow the owners manual you would be due for an oil change every 100 hrs/1000 miles/yearly. It is highly recommended that you use synthetic if you ride in the winter. I have found two different suppliers that have oil change kits for the 2023 zforce 800. One uses Maxima mineral oil with a price tage of $48.95 free shipping and one that supplies full synthetic for $69.95 (don't know about shipping charges though).