I use a MK Endura for primary power and have been annoyed by the turning tension adjustment moaning when turning the motor. Tried Armor-all, oil and wax, but the moans always returned. Then I tried putting 2 layers of teflon tape, the kind plunbers use on pipe threads, on the shaft under the tension adjustment collar. Been turning smooth and quiet ever since and my boat is again stealthy. :

I got the same problem : Maybe I'll try that. The only thing I used so far was wd-40.