I've had an Ebonite "The One" for two years and hundreds of games now that has not even come close to quiting.  It just keeps on going and going and going like the Energizer Bunny.  This is definately a medium oil ball.  It can be made to work on light oil with some polish, very light hand and extra speed.  In heavy oil it reacts like a white dot, but with good carry.

I recently bought a Gamebreaker thinking it would be like The One (and it is close), but it unfortunately appears to need more oil than I usually get.