recommend 15k mi service?

Montez

I wouldn't and have never done it on my current 2 Nissans or the 5 prior (Z's and Maxi's) and have never had any issues down the line as a result of not. Like some have said all they do is inspect, inspect... BTW most dealers have a check list of check that they do with the oil change that covers the main things that need to be checked. They usually will come out/call you if something is needed or it will be marked off and written down on that checklist on the back of yor receipt! Now when the 30k time comes, make sure that you change your tranny oil, coolant etc etc, so you can have record etc etc.