Motors are good as any I've been around. There is about the same good and bad with a aircooled as there is with liquid cooled. We have some air cooled motors now with close to 10,000 hours and have not been apart. Just let engines warm up before reving and cool down before shuting down just like any diesel. Smaller Deutz engine like the 9650 has will not start as good as liquid cooled 9600s with the Navistars. The next step up from 9650 is the 9670 and it is heavier here and there and uses a bigger block Deutz. The 9700s have very little in common with 9600s. Hydralics have about 23GPM available at remotes and about 2500psi. I've been out to Garys in Williston when he had a bunch of late model other colors out front also. Great guys out there but I'm glad he's the one with all them machines. He's allways been able to keep the inventory moving and I hope it don't stop anytime soon. Any other specific questions on the tractor let me know.