[RodeWorthy]

The guys in the service area at DRV recommend liberal application of silicone spray. Others have used candle wax. There are many posts on this in the forum. Do a search.

The bottom line is to use a dry lubricant to minimize contamination collecting on the gear mechanism.

I use silicone spray and it works for me. It is not technically a lubricant but then as pointed out in your post a lubricant is not required. I apply the spray when the slide becomes noticeably noisy when operated. After the spray treatment the slide moves quietly and smoothly.