Tractor has been running well, since I bought it. I have been keeping the fuel to it so it doesn't come close to getting low. My first question am I supposed to be putting some type of additive int the fuel or in another place on the tractor. It has the DPF filter on it and my friend says I should be adding " DEP" (DPF) Fluid?? I am confused since I find nothing about this in the manual... Second question Anti freeze/coolant same stuff you put in cars or is there something special. Big question , can I put a back hoe attachment on this tractor? What brand and size You guys are great thank you