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Unlikely the N55 is eating that much oil, so probably a leak. Have the valve cover gasket, oil pan gasket, or oil filter housing gasket ever been changed? Those are the 3 culprits. OFHG will be obvious (where the oil filter is) and the one you should be most concerned with as it drips down onto the serpentine belt and can cause it to swell up, come loose, and get pulled in through the crank seal. A VCG leak is easy to see too- look to the left of the valve cover and above the turbo. You'll see a silver lip that runs along the side between the head and VC. If it's leaking you'll have oil sitting in it. Also a good chance it will drip down onto the downpipe and start smelling/smoking. OPG you'll have to get under the car and look, but they always start weeping first before leaking badly.
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