Originally Posted by Aleman
Just because a dealer tells you it's a 5.9 cummins engine don't take his word as I did.. Mine has an 8.3. They had it advertised as a. 5.9.
RV dealers and some owners just don't know .
Part of the problem stems from the HP rating of the Cummins engines in coaches of that vintage . Both the 5.9 and 8.3 had versions rated at 300 HP.
It's kind of nice if you get the 8.3 when you were expecting the 5.9, you get an engine with a boatload of extra torque.
Not great if you get the 5.9 and were expecting more.