On one of the recent threads, one of our brothers from across the pond noted he uses 3 in 1 oil in his guns as it was a fine high quality oil. I have always thought 3 in 1 was one of those oils that my grandparents and parents always had under the sink as a use for whatever oil, but I never realized this was a quality oil that could be used in firearms. Does anyone else use it and have any thoughts on the subject?