Over a brief conversation with a friend and fellow tech, who is employed at caterpillar, he mentioned that the new excavators will have to meet the EPA tier 4 emission standards."Using some of the same principals as Cat's post '07 on-highway engines, (which we both are familiar with) but different." However, since our conversation also included about 4 months worth of catching up, and I had to pick up parts a.s.a.p. for a down machine, that was just about all the information I got. Now come to find out we have 2 new 336's coming next month at work :cheer: , and I'm even more interested in the matter. I haven't done any of my own research yet,but since I'm new here I figured this was a good way to tap into some of the vast knowledge i'm sure is here. Like a wise man once said: "It's a piss poor day if ya don't learn something" What does anybody know about this?