Wow, a quart every 1-2k mi is way too much. Could be a blown/badly leaking turbo seal or an obstruction in the CCV system somewhere causing an incresed vacuum in the crankcase vent line and sucking oil through the intake. You could undo the cold air charge line (fat black hose with red lining, leading from intercooler outlet on left side of a/c condensor/intercooler/radiator assembly and see how much oil comes out of the pipe. Comparing that (which is "downwind" of the CCV 'puck') with the compressor discharge tube (which would indicate a leaking turbo oil seal) for oil would indicate where the oil is being drawn from. The CAC hose and compressor discharge tube are just adjustable screw clamps (flat screwdriver or hex).
Cheers,
Duey
