My 2001 , 4300 has been starting hard in the cold weather. If I warm it up after a few minutes it will start right up I am thinking maybe it's time to change out the transmission oil .it's been about 200 hrs sense the last change. I use this tractor more in the fall and winter for firewood and snow removal. Can anyone recommend a good oil, I have a tractor supply plus a Napa near me.