One thing I hate about "dealer's/ franchises" doing the oil change is the time it takes to do. Personally I do all the maintenance on my TL and JK, oil changes should take at least a 1/2 hour to drain the pan and not put the drain plug back once the stream of oil is still visible.
I let my cars drain for at least an hour ( crazy but I get an extra pint in the pan ) and I don't use a oil filter wrench, just hand tight.
I'm not sure about the Z's engine and the oil required but I use either Mobil 1 or Castrol Syntech which ever is on sale and I buy a few 5 qt. jugs at a time.
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