Assuming it is a USBC approved ball and that all static weights are within the legal limits, it will be legal at the USBC tournament. Have the statics checked before you go. As to whether the layout will perform well for you on light oil, that depends on a lot of things. First, what ball are you talking about. Is it designed for light oil? How do you throw the ball, rev rate, speed, PAP location, axis tilt and rotation. How skillful are you, can you change your release when needed? Can you play various angles to the pocket? If you have a good pro shop operator he will be able to give you a better analysis of how the ball will work for you than we ever can. Good luck -- JohnP