OK so I'm skeptical of this system. My question is how does it work? It says I can go up to 10,000 miles on my focus before a change. How does it decide that? Does anyone have an olm that they listen to and have clean engine pictures to prove it's accuracy. I am nervous about 10,000 oci with a syn blend and a motor craft filter. ....am I just living in an old way of thought. I plan on keeping this car a very long time.