No surprises for you there then, although I don’t think the 3901 uses def. I have only one experience with a 3901, and I had to leave it pegged for a regen while I drank coffee. No hair off my chin, but it did sound like it was rippin. That is definitely a strong engine in the 3901. The 2501 engine is a lower rpm engine, and is fine if you “lug” it. Also, I really did not need the HP for a TLB tractor.
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