(27 Jul 2020, 12:35 am)streetdeckfan wrote I'm not a mechanic, but If it was down to the engine being over stressed, I'd think it would be more of a catastrophic failure than what actually happens.On the B5TLs & B9TLs (B9s were 310BHP), it will possibly be down to gear ratios & torque more than likely.
To me, if the engine is being over stressed on a motorway journey, that is down to the gearing rather than the engine, once a vehicle is on the go, it takes very little power to keep it moving. It's the constant stop-start that puts the most stress on an engine.
RE: X9 | X10 - Acquisition of interdeck coaches from Oxford Bus Company