I am using 5w40 Rotella T6 synthetic in my 1000. Prior to that I had bought a CFMoto oil change kit that came with 4 quarts of 0w40 synthetic (not sure who makes it) and the filter but it was pricey at nearly $100CAD, and Rotella is a well known and trusted oil. Got a 5L jug for under $45 and picked up a filter at my dealer for $20. $30 cheaper and I get an extra quart.