Been reading about using mobil 1 synthetic oil on guns, just curious what your thoughts are on this. I bought a can and will give it a try. If it works a quart should last a long time. Allso those that use ballistol claim to get a brown rust in barrel after using, I don't think it is rust myself, I have noticed it myself when swabbing the bore, a brown tint on the patch. What you guys think?