I use Mobil 1 in my Kimber Stainless. It requires a fairly thick oil that can withstand heat. Yes, I do have to re-oil about once a week or so. I use Al Cass Fast trumpet valve oil on my trumpet valves, not on my Kimber. On the other hand, I wouldn't use Mobil 1 on Trumpet valves. Al Cass, 3 in 1, Rem Oil, and such are too thin for a Kimber. Don't know about others.