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Grant Cunningham said:Motor oils: Generally good boundary lubrication (particularly the Havoline formulations), but very poor corrosion resistance and poor resistance to open-air oxidation. The biggest problem is that their pour-point additives often contain benzene compounds, which aren't a good thing to have next to your skin on a regular basis! I recommend staying away from motor oils; if you must use something from the auto parts store, ATF performs better for firearms use on every count, even if it is a tad more expensive. (ATF is still 1/10 to 1/100th the cost of a specialty "gun oil.")