Apparently every body believes in lubing the door. I have heard that you should not do that because the lube will catch dust. YMMV I do know I have had one where somebody greased the track. Bad news.
Then there is another possible source of noise. The opener may be coupling to the structure through the supports. On "Ask This Old House" one time they had that problem. It was fixed by isolating the opener from its mount. In that episode they used pieces of truck tire to make short extenders. Cut 2 strips of truck tire to be about
3 or 4 inches long. Drill through the ends and use the strips as hangers between the mount and the motor. It worked for them. They got the truck tire by stopping along the high way and picking it up.
Genie openers usually use a screw drive system. That's where your noise is coming from. They sell small tubes of graphite lube (I think that's it - its been a while) for them. Running the lube along the length of the screw quiets them. Its amazing how quiet they become. I do mine every few years. I have never tried spray or WD-40 or oil so I can't speak for any of that, but the stuff made for the job is what Genie says must be used and it works wonders.
I'm one person who thinks it's a good idea to try the quick and simple solution, first. If you'd like to hire sesismologists with big seismograph, and have them study for a few months at your expense, then have at it.
I almost always find that just tightening down all the tracks and the drive line reduces the noise by about 50%. If they get a little loose, they vibrate which causes a lot more noise.
All of the lube suggestions are great, but I'll offer one more noise- reduction suggestion:
If the GDO is attached directly to the ceiling joists, consider isolating it from the hard surface by suspending it on heavy duty rubber straps.
I did that many years ago and it not only reduced the noise in the garage, but also virtually eliminated the noise that was transmitted to the room above the garage, enough that my 2 young boys no longer woke up whenever the GDO was used.
I used 2" wide strips of rubber that was basically the same make-up as a
1/2" thick conveyor belt. 20 years later and the strips are as good as new.
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