Maybe this problem is connected to the new proppitch in 4.11?
If I understand it correctly, high power means low pitch, low power high pitch.
Now, if u dive with auto pp, you will run the engine with too high rpm, which leads to "premature" overheating.
Just a guess, havent tried, I also always flew with manual proppitch before - and only used low pitch in a dive with low power to slow down.
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