Very much so.  When you are using a urethane bowling ball on heavily oiled lane conditions, you will NOT get the same reaction or as much power when hitting the pocket.  You would need to get a more aggressive bowling ball that would create more traction with the lane with will increase the hook.  The urethane ball most likely just skidding through the oil and not really getting the chance to hook or roll.  For a good successful and consistent shot you ball needs to go through 3 different stages:  skid, hook, roll.  If your ball never gets past the skid part then it won't be creating that friction with the lane causing it to just hit "flat" and will cause terrible pin action.  You want you ball to be rolling into the pins when it hits the pocket.  I would definitely recommend a more aggressive bowling ball.  If you cannot afford a new bowling ball or just simply don't want to buy one for a house that you barely bowl on, then...  I would suggest to try and put more of a forward roll the ball that way it doesn't have that much of a chance to be skidding as much as it would before and also allowing the ball to hit the pocket harder with creating more pin action.

Edited on 1/17/2004 11:20 AM