Well,
I just picked up a Crosman/Sheridan C9A in .20 cal which is the same gun..Mine is in nickle ,though, so I guess that makes it a Silver streak.
As far as the number of pumps goes, I think 6-8 should do it. You are not supposed to pump them over 8 pumps I believe.
And yes, leaving 1-2 pumps worth of air is a good idea to keep the seals pliable.
My system is leave two pumps in it, and then put 6 more in it beofre firing the first shot.
As to lubrication, please note that the hole under the forend is marked "air intake- do not oil" so don't do it.
Really the newer guns have synthetic seals I belive so really just pu a few dropps of lube on the pivot points of the lver and you should be good to go.
As to anything more involved, if you have breakdown etc, MAC-1 distributors in California is THE place to have one of these guns serviced. Tim MacMurray who runs the joint is kind of a crabby cuss at times, but NOBODY in the US knows more about what makes the old pupmers tick than he does..
My new "Silver streak" is going to get a Wllimans made Crosman peep sight bolted onto the right side of the breech- that's what those two holes are for..