In the last six months or so I've switched from MPro7 gun oil to SuperLube grease for most of my guns.
http://www.super-lube.com/synthetic-multipurpose
http://www.super-lube.com/files/pdfs/Technical_Data_Sheet_Multi_Purpose_Grease.pdf
No particular reason other than curiosity.
The auto pistols get a reasonable amount on the slides and rails, and a light coating on other relevant parts. Trigger groups and such still get a touch of light oil (MPro7) when appropriate.
Mostly I've been shooting an HK P30 and a Ruger MKII. The Ruger has been in the safe for years, but recently got a rail and red dot and has been seeing regular use. It has become a really fun plinker with the red dot!
I haven't had a malfunction in the P30 in years (10k+ rounds), and it seems to like the grease just fine. I've been doing a field step and light clean every 500-1,000 rounds. It's an EDC and the grease has stayed put, when with with every day IWB carry.
The jury is still out on the Ruger. The rimfire cartridges are dirty, and the visible fouling is quickly obvious in and around the chamber and port. It has been getting grease since it came out of the safe and back into rotation, so I don't know if the grease leads to more fouling or not. I can't remember what it was like with oil, and when I was shooting it before, it was with different ammo, which may or may not have been cleaner.
It seems to function fine, though occasionally when especially dirty, it will fail to go into battery on the first round of a magazine. A tap to the charging handle will remedy that. Also, I have been wiping it down without disassembling it every couple hundred rounds and occasionally wiping a touch more grease onto the slide with my finger. Not sure if this occasional first-round malfunction is related to the grease or not, though it does seem to be related to the level of fouling. When I first pulled it out of the safe it was running (old) oil and seemed to malfunction more frequently.
At some point I'll probably switch back to oil just for comparison's sake. I'll also disassemble and see if the grease and extended cleaning intervals have led to any increased wear.
The Ruger spent the night in the trunk of my car at about 30 degrees and first thing in morning, both guns saw a few hours of action with temperatures right around freezing.
I know that's not very cold for you non-Texan's (lol), but the temperature seemed to have no effect on the functionality of the firearms with the grease.
I know, a long rambling post without much of a point. I guess I'm thinking out loud and reflecting on a fun day at the range.
Be safe out there. Merry Christmas and Happy New Year!