I only have one walk-behind mower to pull so a V6 will do just fine for me. I really don't know much about these engines. What little I have heard is that alot of the Ford 4.2L's don't seem to last past 150k miles before blowing up. Again, I really don't know; it could be due to hard driving, and poor vehicle maintenance. I haven't heard anything about the Dodge 3.9L though, and have not heard very much about the Chevy 4.3L. Could anybody give their experiences? Thanks for your help.