Tier 4 NH combine last yr... had to quit early twice last yr b/c of a def glitch that put engine into limp mode, then loose two hrs 1st thing in the morning while mechanic does a computer flush... and then there's the 210L def barrel to pack around in the fuel trk... worst of all my fuel consumption has gone up about 10 - 15%, burn 1.15L of fuel to lower ppm per 1 L... insanity!