DEF and DPF tractor owners

Big Dog

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I’m looking to buy another tractor, cab, larger than my current 2006 Kioti DK45s. Anything over 30hp today requires NOx emission requirements and DEF and DPF methods are used in tractors. I’d like to hear some feedback on you tractors performance with either technology. I’m not unfamiliar with either technology (actually teach it) but I’m wanting to know you experience with either with your tractor.

Should I look for an older, used tractor or be confident in the newer tractors with soot/NOx control?
 
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