NOTE. there are many ways to reach EPA complince every one has fuel quality as the paramount #one thing... the e50 has KUBOTA V2403-M-DI-TE3B-BC-4 . NO HAVE HAD NO ISSUES other than poor fuel. now how as to best achieve performance HP ratio to load with out making smoke soot etc. dude as tech I play the im dealt. we got the Kubota we got the Doosan we got the bobcat Doosan built. they are all good they have been all overengired. they don't smoke whether its dpf def. or whatever is going to next. it all comes down to quality of fuel. winter mix summer mix texas or north Dakota?? I got no answers. I can say for sure that a 743 with a 2203 with 130lbs of compression .(might have to glow a couple a times) will start and run, and work all day. or deutez bfm1011f will run on kerosene dskill. or bourbon. . for about 10.000 hrs got no answers. hug a tree. you might get some maple. IN REALITY I UNDERSTAND the need for lessing our environmental impact I hunt I fish. but im also a heavy equipment tech. we take great pains to lessen our impact. and we have gotten smart about it not due to epa not due to osha or misha. but because this is what we do. work smart work hard. STAY SAFE this includes teaching the the rookies how not to get killed. (which happens faster than you can blink. sorry guys ranting