I think Shadytrickstah111 is right. Sounds exactly like a stuck injector. If it was something that effected all cylinders like a vacuum leak, sensor, or FPR, the car would run like ass. A stuck injector would only effect that cylinder. Couple that with the huge ammount of fuel needed to thin oil (daaang!!), and the only thing I can think of that fits the bill is a stuck injector.