I read that q&a years ago too, NZ guns magazine. From memory it was either Peter Maxwell or Nelson Collie that answered. The authors reply started out saying how engine oil was specifically formulated to protect moving parts at extreme temperatures, to prevent corrosion in the most challenging of conditions etc. Basically all the things we ask of gun oil. It concluded that engine oil will not harm a gun and was better than no oil.
That was back when there weren’t many forums and if you had a question you might be waiting a few months for the answer, at least it was answered by someone who knew what they were on about. Times have changed considering you can get ten plus answers in the same day these days.
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