i believe the 5140 has a turbo (for emissions, no real power difference), the predecessor 5040 does not. don't know the other feature differences.
it was just an emissions update.
What is the difference between a Kubota M5040 and M5140? From what I have looked up I can find little difference but Kubota would not have changed the model number for an identical tractor.
Yes, the m5140 has the emissions add-ons-not desirable. And the price runs about $3000 more.