Comparing pre-emission truck values for this thread the pre-emission truck values are considerably higher than emission controlled trucks. Also, the cat engines have never had reliability with their dpf systems. For us, I would stay away from the cat because of what we have heard and experienced with trucks. As for harvesters, the problem really arises when a code comes up for emissions and within a half hour to an hour the codes will shut down the engine until service work is performed. Down the road ten years these will become most likely less reliable. I don't think any of us want to be shut down waiting for service if we have the choice. I would go with the man engine without a doubt. The man v12 in the 980 claas and Krone 1100 are very good with torque and power.