The JD 4020 series, which include the 4120, 4320, 4520, and 4720 tractors, all use the American, JD Powertech engine. The smaller CUT's do use the Japanese Yanmar engines. Some say the Powertech engine is assembled in Mexico, but technically, that is still part of "America". Certainly much of the profits from the sales end up back here in the States. I do know for certain that in about 7 years of relatively hard usage, the only trouble I have had with my 4120 has been that I had to put a new starter on it after about 3 years. I got an aftermarket "powerstrike" starter from Amazon for around $130 as I recall, and it has been much better than the OEM Bosh unit that came on the tractor. No way would I replace a unit that failed prematurely with another, when a cheaper alternative (Powerstrike) exists. I actually got the brand-new JD for less money than a comparably sized Kubota (GL 4330), and for about the same as a lighter duty New Holland (?40) that did not include a removable-bucket as standard equipment as did the JD. My tractor even still has the original equipment battery. When it comes down to country of origin, its hard to argue with keeping it as American as possible especially when it gets you the best price. I also think you should be looking at 2 tractors, with something like a 4120 for the larger jobs.