Re: Best Type of Grease for Vex Plastic Gears?
Hi Markpinto,
As far as I could see most Vex plastic gears are made of Acetal (POM). Acetal is inherently a low-friction plastic and is considered very suitable for gear applications.
If, however, you positively require lubrication, this should not be an issue. Acetal is generally quite chemically inert and a wide range of lubricants is likely to be suitable. I think the ones you mentioned will be all right, though personally I wouldn't use WD-40 because it's less likely to stay where you want it (and I also hate its smell

). You could also use petroleum jelly.