In the manual I have, XPS 4T 5W40 Synthetic blend oil, but I would tend to agree with Ron on the formulation. I've jumbled oils around in my old cars as well as my off-road Jeeps for a number of years, and have almost never taken the 'default' seriously. It's about what's best for the motor and the conditions in which you will subject the vehicle. I did a little looking and found this - Can-Am New OEM, XPS 1 US Gallon (3.785 L) 4T 10W-40 Synthetic Blend Oil, 779426 for $52 USD. So that would make the oil for an oil change at right about $60 to $65 USD. Still trying to figure out the part numbers/possible source for the O-Rings and seals, as well as the filter. Even with a K&N I can't imagine that the price of a filter and O-rings come up to the $140USD price of the "Can Am Oil Change Kit"...