We use Liftco. They come new with white lithium grease on the shafts. As I recall, they have a bronze screw bearing that rides on the shaft. You can go back with the grease, or even use WD-40. The grease collects dust and dirt and can get gummy. The vertical slides also need lubing too. That is the chrome shafts that are about 16" long that the arms slide up and down. If your slide sounds noisy, that is the first place I would look. We use the lithium grease on them too. But it works better than WD-40 or silicone spray.
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