When I bought my C14, I did the first oil(s) change at 200 miles. I then went on an 1800 mile trip. Changed it again at 2000 (dealer did this). He didn't voice any concerns over the mileage. I will say what they did was highly overpriced. Unless you have a very good dealer, I'd do it myself and just document it. By the way, the plugs don't need changing at 7.5k miles. I still have mine in at 47k.