I feel liek my car is burning oil.. I changed my oil 2 weeks ago, and only 4 quarts came out of the motor when 5 was put in. Thoguth i waited 5000 miles before i changed it 2 weeks ago. I just checked my oil tn, and its a tad low. How could this be, its def not leaking from filter, or drain plug. I drive the car really really hard, and someone told me that could be why. ANy ideas?