Its not recommended, but you can not clean your equipment and continue to throw them. As long as you are taking the oil off the ball as you are bowling with a decent towel. Maybe he doesnt see enough oil for the ball to be seriously affected and the center keeps the curtains and belts in great condition so he doesnt really have to keep them clean. Just depends on your area and what center you're bowling in.

Around my way, i have houses that as long as you wipe the oil off, you can pretty much throw the ball until it falls apart. Then you have the houses where after a few shots the lanes grime the ball up and you're reaching for cleaner after a few frames. Just depends on your preference. I just spent a weekend at a bowling training program where coverstock sensitivity was an essential part of ball reaction. So i clean them after every use. Just a preference.

Well, like i said depends on conditions. He might throw the ball up the boards in the friction, might have a low tilt to get the ball to turn the corner.

Lol! I feel you on not having your equipment die without maintenance. Oh well, we cant all do it. I know a guy who polishes his ball with finesse it, spins the heck out of it (90* axis rotation), with an extremely low tilt so he can stand left and throw right. He never cleans his equipment and in turn shoots a decent score every now and again. In his mind, he's a guru, in real life... he's nuts for lack of a better term.

Like i said, preference.

so if i dont clean the ball would the oil make my 16 lber over weight , just a silly question that entered my head

first, a 16 lb ball usually is somewhere between 15-12oz and maybe 15-15oz. after drilling. If you had a ball that weighed 16.00000000001 that would be considered illegal! I have had 1 bowler with a ball that when drilled was around 15-15 1/4. He used the ball all season and regionals, and when weighed in Reno at the ABC (quite a few years ago) was told that it was over 16 lbs. Was it oil absorbtion? Can't really say as a large hole was drilled in it and when he came in the shop, it weighed about 15-14 1/2!
I would assume that the closer, but under 16.000 the ball is, there is a possibility of it "gaining weight" to become illegal.