are there any common problems with these engines ? and also i have been told to not drive this truck during the winter because it will rust severly right away since it is a little rusty and crusty? do you agree, i wash alll my vehicles often and snow never stays on them for more than a day , any idea what the top speed of this thing would be i am hoping around 120km ish so i can at least take my quads back and forth at a reasoanble rate and thanks for the great hints and tips