I recently took my 2005 Elantra into the dealership for its 30k mile service. However, as I was relocating at the time to a new apartment and money was tight when they told me it would be $900 I told them just to change the oil. When I refused service the tech said "You don't want to void your warranty". I'm only 3k miles past that point at the moment. Does that sound reasonable to change some fluids and do some general maintenance?