Which risk increases when a turbocharged engine runs at sustained high RPMs under lean fuel conditions?

💡 Explanation

When a turbocharged engine runs lean at high RPMs, EGT (Exhaust Gas Temperature) increases; thermal stress causes turbine rotor overspeed because of decreased gas density. Therefore, turbocharger failure results, rather than piston ring failure, catalytic converter meltdown or bearing wear which each originate through distinct thermal or mechanical overload mechanisms.

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