I've had a 1630 since 1999. I bought it with 208 hours on it, (it was a 1997). I've put over 500 hours on it and haven't had any problems with the block. Early on there was a problem with the injector pump, but after fixing that there has been no problems with the engine. I have had problems with the dash, in that the fuel gauge and temp guage aren't working. Tried to work on the connectors but to no avail. A new dash costs $460.00. So I'll just fill up after each use and keep the radiator screen clean. I use the tractor for mowing about 4 acres of a 10 acre property, and also moving trees and snow. I really can't complain about it's reliability. Paid 15k for tractor, mowing deck and FEL in 99. Good luck.