Back when I was a newb, I bought the usual "gun oil" and "gun grease" from the gun store. Discovered that the old standby, 3-in-1 oil was about the same stuff and a lot cheaper, too. But since I still have the old "gun oil" and because it works I continue to use it.
m just about out of it now, and when it goes, I'll be switching to Mobil 1 oil and grease. I always have some here. It kills me that I bought all that stuff back then when I could have done like Alan does and just salvage drippings.