I see no reason to change the tranny oil at 30k since it is not like motor oil exposed to combustion. Filter is 996 110 253 01 which you change at 60k - no filter on a 2002 up. My warranty was over 5 years ago. They cannot force you to go to a dealer for service to keep your warranty. If you DIY keep receipts and take pictures. But if you need goodwill from your dealer you will have problems since you did not pay them $300 for an oil change. Also if you sell you will not have the stamp in your book.
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