38 years in the plastics business for me and the only lube you ever want to use on "Delrin" (acetal) is Crown 68034 Silicon Spray. Not some generic silicon spray from Ace Hardware, but Crown 68034 specifically. We've tried them all...
I've never used any silicone sprays on delrin. I supply a little tube of Formula 5 lube which is super sticky. Due to the properties of delrin, I have not had any noise issues in my car or any of my customers cars.
