Gun oil or gun grease??

This debate approaches 9mm vs .45 proportions. :D With a modern M&P (9mm) it hardly matters what lube you use - but less is better than more, particularly in adverse conditions. Follow the manufacturer's recommendation, unless you have particularly strong reasons to go your own way. I won't use oil on my over-under shotguns, no matter what Perazzi says. :D

I'd be a lot more concerned about keeping the gun clean.
 
I use both oil and grease but most times some of each . I never use firearm related products as cost is to high for what you get .

I use full synthetics like red line , amsoil or royal purple over the years but today moble1 or pennzoil have good produces to and you might get some "empty containers from better oil change shops and grease . I use a 5-20 oil for the last few years and grease .

My vehicles have used these type products for decades and the oil even when you think a container is empty you can still let it drain over night and get a good amount out of each quart container . Small 2oz bottles with a needle tip gets the oil were you want it . I grease my small tractor and mower hubs so the full synthetic marine grease can also be pumped into a small container like old 35mm containers and applied as needed to a firearm with a very small tool like a eye glass screw driver . . It can be as thin as a hair when you remove the small screw drive to apply to a handguns rail and add a small amount of oil too and scope a small amount for the barrels lugs .
 
Sure the engineers are smarter than some folks but simple search shows S&W has had Quality Control issues for many years so perhaps there quality is lacking at times and there testing is , well maybe over looked at times .

As far as lube goes , do some testing and make up your own mind . I test new handguns with my lube but there ability to function in cold weather by spending a night in the freezer at -1 or -2 then walking out side and fire a mag full of cold ammo in it too . Never had a problem with the lubes I use going back to the 1970's for hunting too .
 
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Wow… firearm cleaners and lubricants are as personal as toilet paper.

During the past 4 years I've watch 100s of YouTube videos on firearm cleaning and lubrication, I disagree with about 50% of the methods used. Several are very misleading and wrong according to the firearm manufacturer.

I don't recall any owner's manual recommending "grease". Over my past 47 years of owning firearms, I've tried many different cleaners and lubricants.

Over the past 4 years I've tried a dozen different popular products. The Youtuber Project Farm did an excellent comparison of cleaners and lubricants. I've been using Hoppe's for cleaning and CLENZOIL for lubrication.

I do not use anything that sprays, it makes a mess, and I already breathe enough lead and range fumes. I prefer a small 1 oz. bottle with a needle applicator for lubrication and a cotton swap on wooden stick for cleaning with Hoppe's, and old T-shirts cut up into small and medium pieces. Because I clean my firearms after every use, I rarely use any brass or plastic brushes or snakes. I always wear nitrile gloves when cleaning my firearms.
 

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