BT opined

the oil will "streak" in the slip stream
changing power prop settings "even to fine" will cause the seals in the prop
hub to flex, why move them more than you have too.

Because the governor is constantly changing the blade angle, and thus
aggravating the leak. Going to fine pitch means that the blades will move
only once more for the rest of the flight.



-ash
Cthulhu in 2007!
Why wait for nature?