Same Thing again... changed the plugs, went to do an oil change, only 1.5 Qt left!! Scary! I removed the plugs and observed that the plugs thread was oily on 1 & 2. I wonder where the leak can come from... thats a big amount of oil being burned in such a small amount of time!
No leak anywhere on the engine or underneath and I didn't find a big amount of oil coming in the pcv cables from the valve cover or the crankcase.