[S2K2K4]

Agreed with 2g. If there was NO oil then the oil pressure light would have come on. Even low oil will cause it to blink. Also if your burning through it that fast (if theres no leaks then its gotta be being burnt) then you'd notice a blue cloud behind the car wherever you go). Like 2g said, monitor your oil level on a daily basis and see how quickly it is disappearing.

 

[S2K2K4]

A compression test would tell you if you have bad rings or valve seals, then a leak down test will tell you which one of those items is bad.