And how exactly is this a bug in anything but your engine design? It even says what is wrong: too high RPM, bottom end parts fail. In this case it fails so hard, it cannot even idle -15 quality is not helping here either.
I found a bug/typo in one of the scenarios: Inline 6 Engines -> Conqueror of the Rings
It requires an Economy of less than 700 when, I'm pretty sure, it should be Emissions less than 700 as Economy usually hangs around the low single digits.
Not sure if this belongs here, but I didn't want to create a new thread if it wasn't needed.