This all said, there is something about the smell of Hoppes. I also use synthetic 0w20 Mobil 1. Soooooo much cheaper. I run it in all my guns, especially rifles.
All of you do know that Hoppe's #9 is really old school tech?
It was initially developed as a Black Powder solvent.
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I've been using Gunzilla now for awhile,with good results.
Years ago I read a U.S. Army manual that informed the reader that automobile oil (then) has sulfur in it and thus should not be used in firearms as that element will allow the piece to rust. I never understood this directive as, to me, steel is steel and rusts the same. Perhaps Mobile 1 has improved the formula- omitting sulfur- or the manual's information was incorrect. Anybody have an opinion on this matter?
army manuals are full of %^&*
I have been using Weapon Shield, a lubricant developed by George Fennell. Weapon Shield has been rebranded from its initial product name FP 10 that was released and spread through the USPSA competition community back in the 90s. If you go to YouTube George has a whole bunch of comparison videos of weapon Shield to just about every other weapon lubricant you can think of. Very interesting videos and from what I understand FBI Firearms unit in Quantico has done independent lubricity testing and weapon Shield is the best small arms lubricant they have tested to date. But that's just my two cents and there's a lot of good lubricants out there.
Only Mobil 1.
Sulphur is a deliberate addition to lubricating oils, including the PAO base synthetics like Mobil 1. It is a necessary anti-wear additive. You will often see an oil described as low, medium, or high SAPS (sulfated ash, phosphorous, sulphur). High SAPS oils have the greatest anti-wear properties, but damage catalytic convertors and diesel particulate filters. EPA is forcing lower SAPS oils on the market as CC and DPF usage expands.
The ability of a lubricating oil to prevent iron and steel corrosion is a function of its TBN (total base number). The higher the TBN, the better the corrosion protection. Brass, copper, silver, and nickel are a different case. Higher SAPS oils increase corrosion of these metals, regardless of TBN. Die cast zinc may or may not be corroded by high SAPS oils, but this is quite complex.
As long as you are lubricating steel and aluminum, the higher the SAPS and TBN in your oil, the better.