From what I have seen with the Big Time, I believe there are better choices a s a true oil ball. I'm not too familiar with Ebonite, but I think the Xcel particle would be a better choice, and if he's not just into ebonite, Track Rule GP 2, Hammer Big Deal or Real Deal with surface, Brunswick Ultimate Inferno with more surface, Roto-Grip RS-X with more surface, and probably the best choice in the X-Factor Vertigo from Storm. All the ball listed should be drilled very strong to maximize the reaction you want to gain for heavy oil. From what I have seen, no other ball has a better midlane and backend reaction as the Vertigo, as I have seen it cut through a good amount of oil on a 45 foot pattern. The most important thing is matching up the layout to the bowler, and adjusting the surface properly. Any ball that is drilled will need to be taken down to at least 600 grit if you want it to be purely for oil.
Matt Limardi
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*Erie Community College bowling*
Buffalo bowlers are the best all around in the country.