I've used 60 grit in match play tournaments to blow a hole in the oil pattern/to help create a look.  I would never use it as an actual strike ball line, but I have thrown a ball with 60 grit before.  I always keep a fury with that sand paper in the car just in case of an emergency.
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www.bowlingsolutions.com

Move left, hook it more.....

Tommy Jones and Kenny Simard are Gamecock fans...are you???

We shall now refer a 4-bagger as a hambone...Mark it down the revolution has started!

Edited on 9/17/2008 12:02 PM

Edited on 9/17/2008 12:02 PM

first off make sure its heavy oil and not just a flat pattern which can make you think its heavy oil.

and 2nd i would do as others said. no less then 4-500 grit.

other then that if theres that much oil you need a particle ball or just whip it straight at the 1-3 (if righty)
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Visionary Test Staff 08/09

all visionary this year

blurple
ogre ss
glad.
glad. pearl

Much under 400 grit and I'm surprised the owner doesn't kick you in the nutz.

If it don't work at 400-500 grit, you need skills and a spare game, not more surface.

My last week of PBA experience was the old 50' US Open shot, except it was at least 55'.  Even a guy with a lot more hand than me saw nothing but hydroplane.  We were on 1 and 2 and walked down the end to see which pattern they put out, since the new Open shot is 37'.  Even my 500 grit Weapon of Mass Bias didn't hook until the pin deck.  Played a very direct line with a 1000 grit Tour Power and did pretty well (565?).  The problem with super low grits is that you eventually chew up the head oil, but still have a big load from the mid lane to the pin deck.
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Penn State Proud

Ron Clifton's Bowling Tip Archive

there were several pba regional tournaments i bowled where my mammoth was wetsanded 220 grit......on almost new brunswick proanvilane synthetics and bowling on the cheetah pattern this is a slick condition.