I believe the $700 includes replace manual transmission fluid and rear differential fluid, and a lot more compare to the 15k maintenance.
Make sure you asked the dealer and find out what is actually covered in the maintenance.
I am about to hit 30k and I was quoted for the similar price.
Also, I believe the Z does not come with in-cabin air filter and the dealer say they will deduct $100 for that.
Hope this will help.
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