Cat c7 diesel. Excellent tires, a lot of recent upgrades including flooring, residental refridgerator, front sway bar, air bags, and engine matintenance items, belts, hoses, etc. 7500 watt Onan diesel generator. Excellent coach for the money. We've used it to race ATVMX nationally. We've had this coach for 2 race season and traveled to 14 states. I know the coach well and would trust it to go anywhere.