There's nothing really wrong with using a house ball as a spare ball, if that's all you have. Not knowing the situation when he said "get rid of it".
He might have just wanted you to take it off the ball rack. When you have 5 man teams, there's like 10 balls on the rack. Most ball return racks only hold 10 or 11 balls. Leaving spare balls on there, can cause problems with returning balls and some guys get real worked up if there are 1 or more spare balls on there.
If you use a spare ball, after shooting your spare. Wait for the ball to return and remove it till needed again (a lot of returns have a double decker rack now for the spare balls) as a courtesy.
As for pushing the oil. If you were using it as your strike ball and playing a similar line as him, any affect on him would be minor. But just using it as a spare ball would be meaningless. Now if several people were doing it might be a different story.
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