2muchsoysauce4allthisrice
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I hear running differential gear oil (such as 75w140) smells pretty bad; when it heats up at the range. I have some extra that I havnt used for rear different fluid changes yet, and thought about running it in a semi auto; but havnt yet because of what I read about itWD-40 Smells like crap. If quality motor oil is good enough to protect pistons, rods, bearings, crank, etc etc in a thousand horsepower engine while slamming your foot to the floor, it's good enough for your firearm