I've been casually looking for a good deal on 4100 over the past few years. Currently have a X595 with 3PT and PTO, but looking for a 4100 to keep up at my cabin 2 hours away. I found a 1998 4100 within 10 miles of my home for $3500/offer. This is the lowest cost 4100 I have ever seen...
I've been using Amsoil 15W-40 Heavy Duty and Marine oil in my X595 Yanmar diesel. The 15W is too high for my climate (Wisconsin). I do run it a lot in the winter for snow plowing. I believe the Amsoil premium 5W-40 API CJ-4 is the best choice from Amsoil to use for my tractor. Let me know if...