thoughts on the M11 Cummins?

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(03-21-2025 )Jas2153 Wrote:  A friend of mine just bought a 97 Freightliner day cab that has an M11 in it that needs to be overhauled. He's looking for some opinions on just how much he would be able to haul with this motor. We're trying to decide if he just should take it out and go with a bigger motor or go with the overhaul. We're in southeast Texas where it's pretty much flat so he won't be going up an hills or mountains. All opinions would be appreciated.

I wouldn't be afraid of an M11. Though I never personally owned one they're a precursor to the ISM but more akin to the N14. The ISM was capable of grossing 80k with proper gearing and delivered respectable mpg's while still weighing 400 lbs. less than the large bore engines. If the parts are available, rebuild it and go trucking.