I took apart only a couple of old guns. Two were A&D, one a Grandpa's gun which he used for about 10 years every weekend in season on waterfowl, hares and big game, then it was my Dad's opening-day gun for another couple of decades. The other a 1958 vintage, was hardly ever used until I got it in 1994, and it was my go-to gun until I set it for honorable retirement (too much sentimental value) in 2006. Neither looked like it needed cleaning and lubing, although my gun did have a broken mainspring once. My experience is too limited to come to conclusions, but that still leaves me wondering how much cleaning and lubing does a good double really need.