Mahindra probably makes the engines for the vast majority of the tractors they sell worldwide. In the USA we sell a lot of the smaller units, hence we see Mitsu engines often and some Korean sourced engines in some models. Then again, the USA probably accounts for only 10% (rough estimate) of Mahindra's worldwide sales. This is truly an international company. Mahindra must make nearly 200k engines per year....so yes, Mahindra makes engines. Mahindra also builds airplanes, most people do not know that, although most folks know they build cars and trucks.
Mahindra spent a bunch of millions developing a Tier IV engine that does not need or use a DPF. Pretty slick, common rail and a DOC, but no DPF. Therefor no burn off cycle, etc. Also, all of the Mahindra engines of which I am aware are wet sleeve industrial type engines. If you ever need to rebuild, you can slip new cylinders in the block in-frame and new pistons etc and you are good to go. A cylinder that is cast into the block like most smaller engines requires engine removal, boring, etc. Not a big deal at the compact tractor level as people generally never put on enough hours to wear out an engine, but it is a positive point. We have had a few big old IH or JD tractors in the shop with a ton of hours needing rebuilding and it is pretty cool to just slip in new cylinders and pistons and off you go. Well, it's a little more complicated then that, but you get the idea. The Mahindra Tier IV engines are the same way.