What do you use to lubricate jockey wheels, particularly the ceramic & sealed type? I find that grease is too thick to get into the bushes & doesn’t provide a sufficient lubrication surface & that normal bike oil too thin & not long lasting. This is my first time with ceramic bushes & sealed units (the jockey wheels are Shimano Ultegra) & after strip down & cleaning are ready for re-lub & assembly. What do mechanics use?