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Originally Posted by withidl
Incidently, at cold start-up the transmission's pumping of it's oil to the radiator functions in reverse in that the transmission draws heat from the radiator coolant being heated by the engine so as to come up to operating temperature more quickly.
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Also the gearbox chooses to remain in either of the performance-oriented maps (either XE or XS) up to a certain temperature and gearshifts are inhibited to allow the engine/cats to reach their operating temps more quickly.
I'm sure you're right about the heat buildup in MS due to the engine revs AND the heat buildup of the transmission fluid being dissipated via the engine cooling. It's a shame because if you drive hard during hot weather it ends up causing the engine performance to be reduced and gearchanging to be inhibited. So in other words by driving too quickly in MS mode, the car effectively becomes slower due to this heat build-up. Guess you can't get to have your cake 'and eat it...