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My theory is that the gearbox is inadequate for the power from the big petrol engines but is fine for the diesels. Certainly our lamented barge had no autobox problems at all
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It's the torque you should be worried about not the power and 3.3 diesel puts out more torque then 40v S8 - 480Nm vs 430Nm. And 2.5TDI is not far behind 4.2 A8 with 370Nm vs 410Nm
But these boxes show no evidence of failing because of too much torque going through them, it's design, quality and the fact that most of them are never serviced as 'sealed for life' that result in failures.