I use synthetic motor; 5w for the 22s and 20w for everything else. I add a little superfine moly powder (which is probably unnecessaty) to improve the lubrication. This stuff works just as well as the much more expensive gun oils for a tiny fraction of the cost.
We know that Popeye.
I only use and sell Kano Kroil. It's a cleaner, lubricant, break free (this includes fouling in barrels), it will seep UPHILL. http://www.kanolabs.com/