600 hp

A while back, an acquaintance bought a brand new, 45' luxury DP with a 600 cummins engine. In less than a month, the engine blew! Had to tow the DP back to the factory, totally disassemble the house so they could lift the engine up from the chassis rails. Quite a mess. Fortunately, Cummins covered the whole deal.

Mostly, Cummins is a very reliable product, if properly maintained.