Looking to buy a complete 800 etec engine for a 2011 summit x. Not sure what years will work in this other than the 111/12 since they are the xp chassis. Will newer XM etec engines work in the xp chassis? Prefer less than 1500 miles on engine but at this point I can't be too picky. Dealer installed with warranty is $3500 for complete new engine so price needs to be good for me to go used