Re: Krylox versus Z16 (marion)
The best stuff you can buy is Krytox. It's a solid form of Teflon and expensive, but very durable and impervious to heat and cold. Straight old dielectric grease will work and it's pretty cheap. I think you can get 3 tubes from Mid America for about $10. You'll just end up applying it fairly often.
I've used both, and prefer Krytox.