The whole thing seems odd:
Did it use oil before? If the dealership did the oil changes, did they ever alert you that it used X amt of oil, etc during the last change?
Were you running full synthetic?
I had a highly modified wrx at one point, that pos would burn a quart of oil after about 1500 miles into an oil change cycle... The Z seems to not burn a drop at all being a simple NA motor.
My money is on they under filled it, impossible to prove though.
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