You and/or the RFD guys are off by a factor of ten. This is a unfortunate but common mistake in the computer age. On average, a properly maintained AG tractor with a diesel engine can be expected to go around 12,000 (three zero's), hours between engine overhauls. Since the fuel itself is a good lubricant they can last significantly longer than those equipped with gas engines. To be safe, I always replace my diesel machines at around 8000 hours and do not use gas. Back when I used gas machines, I would replace at around 6000 hours. A tractor with 1,200 hours is really just broken in.