James Thomson wrote on 4/12/2019 1:24 AM:
At 16:16 11 April 2019, wrote:
What oil to use for lubricating control system bearings and components.
Dan

To reply to the original question - oil may be wrong! If your
manufacturer's maintenance manual gives guidance then follow it.
My DG manual calls for grease, specifically "multi-purpose greases for
rolling element bearings". It also warns you that Teflon sliding bearings

should NOT be greased and should be cleaned with acetone if you do
grease them.
As others have said, in general grease for slow moving parts and oil for
high speed parts. And don't waste your time trying to lubricate sealed
bearings.

The control surface hinges are "slow moving parts", but very light oil is the
usual recommendation; the little rollers in wheel bearings turn very rapidly, yet
they use grease. Heat and load are as important as speed, so stick the manual's
recommendations, and forget the fast/slow rule.

--
Eric Greenwell