I'd have to agree with John on the Deere vs. Gleaner and the rolls. The engines he's right about too. It is a little pricey to repower with a cummins, but with a little advice and help, it is by FAR more affordable than rebuilding that air cooled. I can only think of about two machines that i know of around here that are still running the air cooled, everything else that had an air cooled got repowerd, some even got it after they were bought and before they went to the field because the owners refused to run the air cooled. Its the owners own personal experience and_or choice.