I have a polaris diesel ATV. I think it is a 1999. Runs great. Had 2 batteries but replaced them with a single utility tractor battery. No problems starting, even in sub-freezing temps (I live in Michigan). I use it deer hunting, but deer can smell the diesel. Only issue is when going from 4wd to 2wd the front end seems to stay engaged/locked, making it difficult to steer. Also had some issues with shifting to low, but some tweaks to shifting rods have resolved that. A fantastic working machine. Haven't needed a block heater or starting fluid.