See THAT is the problem with Engineers.
Never grease nuts / bolts / threads. I bet none of those propeller heads ever had to take one off that's been in the field for 4 years!
It weakens the bond, well one could also argue that the extra slipperiness, makes you actually twist it more to achieve your torque so you have compensated for the change the lube will make to the overall strength of that bond.
If something is not going to be taken apart again, ok don't lube but if you need to tear it apart, replace parts etc sometime down the road, do yourself a favor and use a bit of anti seize or something.
personally I don't think ANY engineer should ever be allowed to get a degree, without actually putting together and making it actually WORK... the contraption they designed that looks great on paper
and NO they do NOT get to bug the field tech for hints and pointers either !!
Aaron