I use shooters choice FP10. I dont put it directly on the pellets but rather on a cloth and roll pellets around on it. If I can feel oil on my fingers when handling the pellets, then it is too much. I found the oil makes the barrel more dirty but it is much easier keeping it clean. Probably less lead and more crud. After a 100 or 150 shots I just run two felt pellets through the barrel. Keeps everything nice and balanced.
There are only two things infinite: The stupidity of man and the universe. And I am not sure about the latter. - AE