Re: Wondering if there was a 280 or 300 with the M11,
Reply #5 –
Would only be found in a U300, all U280's had the Cummins C/8.3 liter engine.
And up until late 1994, the U300 came ONLY with the Detroit Diesel 6V92 two stroke engine.
Then in 1995, two different engine were added to the mix in U300's: Caterpillar 3176 and Cummins M11. Both the latter with Allison 4000 series transmissions (vs 3000 series in all other coaches). Both 3000 and 4000 are pretty much bomb-proof, as are all those engines. BUT, at that age, you will find some well cared for, others not.
Example, many first time diesel coach owners have no idea that the coolant is special and different from automotive coolant. Use "regular Prestone" and it can be a VERY expensive mistake.