Cummins M11-450

[travelgirl]

My husband and I just bought a MH it has the Cummins M11 450-HP in it what should we expect out of this motor are we goingto have problems or are we in good shape. we had it looked over befroe we bought it did the whole work on it once we got it home the maintenace E.T.C just wondering what common problems are wr goign to face with this motor.

[FleetMan]

In the early 90's I had a fleet of OTR tractors with the M-11 and had excellent experience with them. 7.5 to 8.5 MPG grossing out at 80,000 pounds on routes in the south west was the norm. You should have all the power and torque you need. Regular and appropriate routine maintenance is all that engine should require.

[Steve Ownby]

Travelgirl,

Fleetman's comments are right on point. The M11 and it's parent the L10 have been around in the trucking industry for a long time.

I think it's extremely well suited to service in a motorhome with a high power to weight ratio and excellent fuel economy. Diesel techs love it because it is easy to work on.

I have an ISM which is the M11 with the Cummins interact system electronic controls. i have driven it about 40,000 miles over the last 4 years and have recorded 7.9 mpg with a coach/toad combo weighing about 45,000 lbs. I would not trade engines for any other in the marketplace.

Keep up the maintenance & it won't let you down.

Steve O

[travelgirl]

Well I thank you for the reply's on the M11-450 in this case I have no choice but to trust what you are telling me. My husband has always been a big diesel person and loves Cat and Cummins motor's I hope this motor treats us as good as it has you and the rest of the motorhome owners out there' timw will tell

Thanks to all Happy Holidays to all

[J Walker]

I have an ISB so no direct experience with the M-11, but an oil analysis can tell you a lot about any diesel engine. Blackstone does them for $25. To put your mind to rest about the condition of your engine get an analysis.