Float Pilot's Cold Weather Firearms Lube Test.
Negative 10 to Negative 25 F. Using Bushmaster AR15 5.56mm and Stag A5 6.8mm
In order of effectiveness on AR platforms
Tetra Gun lube: Adheres to bolt carrier. Very slick
FP10 shooters choice Super slick, works to 65 below zero. Best on bolt action rifles
G96 clp Works at 50 below, thin, but leaves coating
Penn Synthetic Reel Oil P/N 92340 Very Fluid, Extremely slippery
Marvel Mystery Oil Very fluid, Very slippery
3 in 1 Oil Fairly fluid, somewhat slippery
LPS-2 Fairly Fluid, somewhat slippery
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