I currently have 1200 miles on my new 2004 D/A. I changed the oil at 750 miles and I am going to change it again at 1500. From there it will be again at 5000 miles and then every 5000 miles. I have used Delo but want to change to Schaeffer 7000. Since this oil is a synthetic blend should I wait until 10000 miles like you would, if going to a full synthetic.