I just changed the oil on my wife's GX550 at 5,000 miles. There's supposed to be "free" scheduled maintenance at 5,000 and 10,000 miles. I looked at the details and found that the 5,000 scheduled maintenance only includes tire rotation. Everything else is just inspection. I religiously rotate the tires on our cars every 10,000 miles. In my opinion, rotating tires every 5,000 miles isn't significantly beneficial. I asked my wife to call our local dealership to find out if she really needed to bring it in. She called and was told that she did, so she made an appointment. She brought it in today and was told that it would be about an hour and a half. She was expecting for it to take 30 minutes or so and didn't have that much time to wait. So, she asked the customer service representative if she had to get the service done in order to maintain the warranty. The lady said that it would only impact the tire warranty. She then added that there isn't a tire (mileage) warranty. She then said that she guesses not. So, my wife left. Given the conflicting responses from this dealership, I'm not confident in their answers. From a warranty standpoint, does anyone know of a negative consequence to skipping the 5,000 mile dealership service? I'm going to have her bring it in at 10,000 for the "free" oil change and tire rotation.