Posted here a few times by yours truly:
Cold Weather Firearms Lube Test.
Negative 10 to Negative 65 F.
Shooter Choice FP-10 Works very well in ARs and bolt guns. Good to-50
Terta Gun Lube Thicker, works well on crew full auto weapons
G96 Gun treatment Comes as a spray, very light, bolts guns & ARs to -65
Tetra Gun Grease: Good for bolt gun rails, auto pistols. Worked at neg 30
Penn Synthetic Reel Oil P/N 92340 Very Fluid, Extremely slippery good to -65, CAUTION... WILL RUIN PRIMERS
Marvel Mystery Oil Very fluid, Very slippery good to -40
Also cleans fouling.
The not so great:
3 in 1 Oil Fairly fluid, somewhat slippery gums at -20
LPS-2 Fairly Fluid, somewhat slippery gums at -20
Klean-Bore Formula 3 Some separation, fairly fluid, somewhat slippery
Tri-Flow Separated, does not adhere or film on metal
Break-Free Separated, somewhat tacky and semi syrup like
Mil-Tech Thick, somewhat tacky, syrup like
Outers Gun Oil Very thick syrup. Tacky
Mil spec MIL4-46000c Lube Oil Separated, some was in thick jell state.
Rem Oil Thick jell, tacky
Boe Shield T-9 Thick Jell, tacky
Corrosion X HD Thick jell, tacky
Ballistol very thick jell. Separation
Exxon Elite 20-50 Syn Av Oil Very Thick, glue like
AeroShell 15-50 Semi Syn Av Oil Very thick, glue like