My Dad has one of these and it's a real nice ATV. For the first oil change I used the Polaris 2W-50 and a Polaris filter. I'm not sure what my Dad paid for it but I'm sure it was overpriced. I'm sure the Polaris oil shears to a 40 weight anyway so I think I'm going to begin using Rotella 5W-40 and a Purolator motorcycle filter.