I'm getting worried about my STS4. I have the 3.6 and I do about 85% of highway driving. I go between 5-7K miles before changes. I've noticed it's been losing oil...the other day I went to check it because it was getting close to changing it. The dip stick had NO OIL ON IT! I panicked! No oil drips on the garage floor...nothing leaking. Any ideas? Oh, and i dont want to hear about the oil life indicator on the DIC. It's telling me I have 40% oil life. It's on 7000 miles since the last change and nothing is on the dip stick and I have 40% life left...what a joke!