How much oil does it need? Will it work on medium conditions?

Hard to say without really seeing you bowl, but I can give suggestions based on what I've seen so far!

 

Hell Raiser - Anywhere from 4"-5", 45-60 MB angle and 30 VAL angles have really let this ball open up the lane. Depending on your rev rate, you could use an xhole or not.

 

Reckless - All around performer, so far, I like the motion of a 45x5x45 with a P3 or P2. Easy through the fronts with a strong midlane but not jerky backend.

 

Misfits - The Yel/Mag is a little cleaner and slightly less hook, so that could be your dry lane ball. I'd go 5-5.5 with no hole. The Org/Blu looks good with a 4.5-5" layout, but I have not seen a pin down layout yet. Xhole not really needed, but this ball with surface and a stronger layout can actually fit below the Hell Raiser with the same type of ball motion.