The XG-12 Ford Motorcraft Electrical Grease is Nyogel 760G. GM and Chrysler also have it. Can be picked up at your local Ford dealer parts counter.
Thanks guys for all info. I do not regularly use vasaline so I think I am OK. Just used it once. But better safe than sorry. One of my lights is $380 range and definitely do not want to mess it up. Thinking of buying Fenix TK75 2018 and that bad boy will be $300 plus range so need some good lube.
I was always told it was the best. Guess that’s why Armytek started selling it in smaller tubes.
US hardware retailers seem to have bigger ranges than Australian retailers, but the stuff I got from a big retailer here (for tap washers) was brownish rather than clear so I bought some online. It was easier to buy online than visit a specialist shop, and you only need a tiny amount.
I’ve been using this stuff for a couple of years now and it seems to do the job.
http://flashlight.nitecore.com/ACCESSORIES/Others/SG7/
I use silicon, either the paste, liquid or spray depending on what i want to put it on.
I used to use Vaseline on maglights as that was what was recommend dont know if it still is anyway i found it broke down the orings and certain plastic bits of the maglights over time
Krytox. If you can afford it, its the best possible grease for knife pivots and o-rings that you can buy.
A little KY always seemed to make things slide well 
J/K… I use a little tub of silicone grease, probably from Harbor Freight or an auto parts store.
XG-12
I just spit on em.
A stick of butter. 
You use it on your O-rings?
Mayonnaise :+1: 
Lady juice :smiling_imp:
I’ve recently had good luck with Master Plumber Faucet and Valve grease - waterproof, heat resistant, designed to be used with o-rings, valves, washers, etc. $2.99 at True Value Hardware.
I’ve compared it to Syl Glide, white lithium grease, dielectric grease, and others, and it seems less sticky, and more slick. The store rep said it’s silicone based, but you’d have to verify that. I like it. Mag recommended Vaseline. You likely didn’t do any harm, but you’re probably correct to switch to better.
After re-installing the ring, I’ve always used Hoppes 9 gun oil instead of grease on the threads, after cleaning them with alcohol. Things seem to spin together better, especially on Maglites.
Zen
I use XY-2 silicone grease. One of the cheapest I could find.
Though I’m trying to arrange a shipment of XG-12…
Any silicone based weatherstrip conditioner will work. I been working off an 8oz tube of Silglyde I bought 30+ years ago.
The stuff also works great for re-conditioning door and trunk seals, A little dab goes a long way when spread with a sponge application.
For threaded with o-rings, I use a soft bristle toothbrush
The WD is short for Water Displacement. WD40 is not a lubricant. It will clean your O-rings but it will also dry them out if not lubed after cleaning.
I've had the debate of WD-40 with lots of people over the years. That it's a lubricant. Nothing sticks to it because it evaporates.
WD-40 gets used on my fishing lures and baits only.
I get more lubrication rubbing a finger alongside my nose and rubbing it on, then with WD-40.
YMMV