Previous tractor was a Yanmar FX24D, current tractor is a MF GC2400. The BIG DIFFERENCE is the MF has a factory front loader. I built a loader for the Yanmar. Neither caused any problems other than routine maintenance. BUT, the 30+ YO Yanmar did drop a valve and crack the block. Sold it to a machinist who I believe is still using it after sleeving the cracked cylinder.
Timing on the break down, heavy Spring cutting season, is what made me replace the Yanmar. Otherwise, I would have just replaced the engine and been still using it.