8.2 hrs on the new RZR-I took it to the dealer for service, dealer thought it might be a breakdown in oil-no change. The RZR does not do it all the time; cold start, after the ride. It sounds like it's not getting oil, but when you accelerate it stops. I took it back to the dealer, after the noise started again, they can't figure it out but doubt that it's bad. I don't agree-but I'm on my way to Yellowstone for 5 days of riding so I will put it to the test and report back. There is a slight vibration after the noise as well. The dealer is also calling Polaris Monday to research the problem further.