The dealerships aren't going to be consistent. I always used to instruct them to go full synthetic and the cost was about $125. One of the times they charged only $40 and it was because they but in regular oil. I made them change it and they didn't charge me because of the hassle. That was the last time I let them do an oil change.
Their is nothing "special" about changing the oil for the Z so you have to instruct them on specifically what you want done. I would recommend that you call the service department and have them tell you what to do for the consumption issue. Document who you talked to and what they told you to do in case the engine goes during the observation period or during your trek of 23 miles.
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