funny you should ask about cold weather oil. I also hunt in very cold weather and have often hunted at -20c or colder. We have had alot of problems with gumming up of lubricants. A few years ago I did a test of some popular lubes. I used a metal plate that I put in the deep freeze along with some of the test lubes. I removed the plate and the lubes and proceeded to place equal amounts of lube on parts of the plate and reinserted the whole thing back in the freezer positioned at a slight angle, after a few minutes I removed the plate and compared which oil had flowed the furthest. I was shocked at how bad the oils performed in the cold even though they clearly advertise a broad operating temperature range. At the time the Pro-Shot all Weather oil flowed the best, with the runners up being the Break Free, Birch. Casey Synthetic, Hoppes and the Outers. Since then I have developed a lubrication routine that has proven foolproof in the cold. I use Eezox to coat the metal after thouroughly degreasing the gun and this is the second year since the initial treatment without any sign of corrosion. I have not lubricated the gun in two years and it has been hunted for a total of five weeks in cold weather. The cold is not the only problem it is also prone to sweating when the firearm is brought into a warm area after spending the whole day outdoors and this is also a testament of the products corrosion protection. I had never known about Eezox until I saw a test in the 6br forum about rust preventatives and it was also the fact that the product is applied wet but then dries that attracted me to it.