As gun lube, any difference in automatic and manual transmission oil?

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ATF is about 65% detergents and additives. It's less oil and more other ingredients, because planetary gear sets aren't the kind that wipe off oil as the teeth engage.

Manual gear oils have to put up with the teeth engaging in a scraping motion - it's actually used as a method to pump the gear oil in differentials. That's why some hot rodders can't simply flip the ring gear to support a reverse rotation setup - it causes failure due to lubricant starvation.

ATF as a gun oil works ok for a range toy, it will still get dirty regardless. It just holds a lot more gas residue in it, which is a moot point as most people won't shoot them to the point of system failure and lockup. It takes thousands of rounds and has been tested, demonstrated, and even video'd. As said above about all a gun oil does is protect it from rusting while sitting in the closet, and anecdotal testing of gun oils shows ATF is middle of the road.

One thing motor oils and lubricants do not do well is reduce odor. For a hunting gun, they smell just like a truck blundering around in the trees, which is entirely the wrong thing to do and does condition game into learning it's an alarm smell.

For all the black magic and hodum published the last ten years, about the only result is that we recognize a tiny bottle of gun oil is way overpriced. It doesn't mean the most economical stuff we find in a quart jug at the local parts house is a good substitute, or a dab of grease from the chicken fryer either. :D
 
Either product will work well as a lubricant for your firearms, but both will stain your clothing and smell bad. Folks think I'm crazy for paying for Gucci Lube but it has a pleasant scent, doesn't stain clothing and doesn't leave a foul taste in my mouth from the fumes or when it's absorbed through the skin.

In other words, user whichever you like best
 
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ATF is also good for cold weather applications. I also use Mobil 1 0W20 for gun oil which should be good to -40 and is also excellent for gas operated weapons as it keeps the carbon residue from the propellant from hardening up. Carbon residue when it cools becomes an abrasive.
 
One thing motor oils and lubricants do not do well is reduce odor. For a hunting gun, they smell just like a truck blundering around in the trees, which is entirely the wrong thing to do and does condition game into learning it's an alarm smell.
That's not necessarily a bad thing. In farm country, your hunting arm would smell just like the farm machinery that deer see and smell daily, reducing the alarm factor.
 
Personally, I wouldn't use ATF for a firearm lube. Only because I deal with about 400 gallons of it a day while working. Even been showered in it a few times. So much so my eyes water around the stuff. I don't see any reason why it can't be though. It is very slick lubricant designed for all sorts of moving parts.
 
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