As some o you may know I bought a 450D last fall that ran on 4 cylinders. I replaced the sleeve in #4 and the rings as well. The rest of the engine appeared to be a low hour rebuild and was near perfect. I hooked up to the 412 semi mount plow and plowed for about 10 hrs yesterday. I used about 15 gallons of fuel so I am extremely pleased that it is a miser on fuel just as my 400D is. The 400D struggled a little in heavier ground with the 412 plow. The 450D runs away with it. In light soil I made it all the way to 4th gear as I was testing the capabilities of the ole girl. In heavy clay loam it pulled in second beautifully. I am ever impressed with this tractor! What a BEAST!