ranger 500 efi

Ok lets start with the dumb part of this... someone put diesel fuel into my Ranger and did not tell anyone what they had done until it had already ran some through it (tank was not empty and they added it so it mixed in). When I returned to the Ranger it was running bad, not knowing what they...

I have a 2013 ranger 500efi and it seems like I have to replace one or both front axle boots every month or so. Does anyone else have this problem or is there something going on with my machine?

Getting ready yo purchase a ranger and was wondering if anyone has a newer 500 efi they set up for mud (lift, tires, etc.) and was wondering if they preformed well or if I would be wasting my money and should get the 800?