As far as I know the emission regs don't apply to stuff under 80 hp but I could be wrong.
I can tell you this... if I have a choice between an engine with DEF and an engine with EGR... I'll take the one with DEF every single time without a second thought. EGR is a nightmare that doesn't work and never will work on a diesel engine (reliably). With DEF you essentially have a Tier II engine with aftertreatment and Tier II engines were about as good as diesel's got in most respects.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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