ive had good luck with pellgun oil, tim mac's secret sauce, and mobile one full synthetic 5w-20 motor oil in multipumps and pcp's
I had Tim McMurry rebuilt a couple of S&W 77As and have used his Secret Sauce with good results. The S&Ws are hard hitting, but not as accurate as I'd like for them to be.
Make sure that you have some time to spend on the phone if you call Tim, as he has a lot to share.
