I was just wondering if I should change my oil every 5k miles or like what the dealer is telling me - every 10k miles. I have a 2001 CLK and I dont like the idea of changing the oil every 10k miles. I called the service department yesterday and they told me not to bring it in yet, they told me to bring it in when there is 10k miles on the car, I have 5500. What should I do?