The biggest issue with the motorcoaches we have come in the shop (
CAT and Cummins) are lack of maintenance. They think that because the vehicle doesn't move, soft parts don't degrade.
We had a coach come in before Thanksgiving that shut down on the interstate. The primary fuel filter had been in place since 2005, and corroded to the point the case fell off of the media when the tech tried to remove it.
We sold Mercedes powered busses for a few years. 2008-2010. Expensive and complicated assemblies. Many of them scored blocks, and they are induction hardened so they are trash after failure unless you bore them.
Everyone makes trash engines at some point.
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