I can honestly say that I have never heard a bad word about the Deutz engine in wheat and corn country, but in my area with corn and soybeans, the soybean fuzz kills them fast! They are a twice a day blow out minimum when in soybeans, the water cooled N's, R's and R2's have far less failure rate. My local dealer doesn't even like to trade for the Deutz engine combine. And a dealer in E. Central Iowa has had an R60 on his lot for 2 years without a bite, and it is a good looking machine. Deutz engine tractors do just fine here, but not the combines! And every Deutz engine combine to make the area salvage yards has had a blown or burnt engine as it's problem, similar to the early N6(670HI). And if you read the spec sheet put out by DA Gleaner, the R60 is equal to an N_R5-52 in internal capacity. The N_R6-62 are equals, Deutz did Gleaner no favors except simplify(less parts) the rotary design. Your 2 R70's are equals to the R62's in internal capacity(not grain tank),the N_R7-72 are bigger, that is direct info from the spec sheets put out by AC, DA and Agco. Deutz downgraded the Gleaners, or so the spec sheet says. The neighbor found that his R52 has the same capabilities(capacity) as his burned R60 had and is less of a machine than his early N6 was. I have yet to even come close to overheating my late N6 in 200+bu corn and 60 bu soybeans, and the limiting factor of the ground speed is the heads with 6-30 and 20'flex. Normally run 6 to 7 mph on corn and sickle speed on beans, so that I'm not pushing them over.