Bought my 2004 M9 HDCC3 new and paid 52. It's loaded with every option and no emissions junk at all. 3 years ago I bought another M9 but an open station used, from a JD dealer about 600 miles from here. Being a green dealer they didn't have a clue what they had and just wanted it off the lot (green and orange don't mix well) so I got it for a song. It's a 2002 M9 with 3K hours on it. The JD dealer delivered it directly to my Kubota dealer and I had them go through it, stem to stern, everything. Cost me 4 grand but I wanted everything to be up to snuff. My dealer offered me 5 grand more than I paid for it. I also refused.
The pre 4 larger units will only keep appreciating in value as people come to the realization that Post 4 units are ALL having emissions related issues. I loom at them as am appreciating investment. The only issue is, if you lunch a motor, Kubota will sell you a new one, but the old one must be destroyed as in drill a hole through the block, or beat it into oblivion with a sledge hammer. No rebuilding whatsoever.
Not an issue with me. The pre 4 large Kubota engines last well in the excess 10K hours with proper maintenance.