 Hi Tod, Yes, there "is" a cost difference between an air/oil cooled Diesel and a water cooled diesel, and it is, that the air/oil cooled engine will cost you LESS to own! When the tractor gets more hours on it, you won't have to worry about leaky failing water pumps and radiators, radiator hoses, cold corosion, rotting/leaking cyclinder liners, and many more water related problems! Cleaning the fins on the cyclinders is easier than blowing out a radiator too, and they are all so harder to plug up. I've yet to find mine any where near plugged! My Agco Allis 5660 (same engine as 5650 but with more power) starts easily in any weather and NEVER over heats, and has very good low end torque. The only negative i can think of, is the extra noise you hear from the engine because of the lack of a water jacket. I have two air/oil cooled Agco's and they have been great tractors that i haven't had any down time with to date. They could be had with either a 12 speed or a 16 speed. My friend has the 12, and i have the 16. He likes the gearing of the 16 speed better, and so do i. Robert
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