Please help. 2001 Boxster S, 42,000 miles, ran(and sounded) great until I recently moved from Florida to Kentucky. Had car shipped by shipping company. Went to pick it up, and it ran great for the 5 or so miles to home. Didn't start it for 6 days, and then yesterday when I did sounded as if I had a lifter tapping. Turned off, checked oil, down about 3 quarts. No oil under car, so where did it go? Tapping sound not as bad after adding oil. Not bad at idle, worse upon giving it gas. I haven't driven it for fear of compounding my problem. Temps in the 20s/30s in the AM here if that could have anything to do with it...Or maybe shipped at an extreme angle on the truck? Please help, this car is my baby...