With all the bullshit I've been told from my dealer about oil changes I really don't know what or who to believe anymore. They told me to not go by the monitor, to come in at 7000k, and even if I go with fully synthetic oil, still come in at 7000k. I asked what the advantage of having fully synthetic is then, since I've heard you can go almost twice the distance on it, and he just told me longer engine life.