I would say my T337D experience has been the same as mentioned below. For the most part its a non issue, but every so often I find myself in a situation where I have to wait on the ground for a while before takeoff. When this happens its important to face into the wind, even if its an odd orientation. If you are sideways to the prevailing wind, and its above around 5-10 knots it can create a kind of dead air situation in the rear engine and it starts to head towards a thermal runaway. I also keep the engines full rich on the ground so I have unused fuel cooling it as well.
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