That is also my experience.
I have a 4 digit centennial I bought used in the 60s and it has been carried in my pocket many miles and I got curious a couple of months ago and removed the side plate. It looked ok so I put in some 3N1 and put the side plate back on. Ever week or 3 I wipe the outside and inside with 3N1.
I have a M19 that I've carried around the homestead for several years and it gets the same loving care. It lives a harder life than my pocket gun because I carry it in a belt holster so it's more exposed to the elements. It really looks bad when the holster is full of saw dust and wood chips. Blow it off and it keeps on shooting. Larry