I do my own services and no way am I going to go by the indicator. I change mine every 5K max, usually at 3K. They are pushing the manufactures into longer intervals to be environmentally friendly. BMW does the same thing, they change theirs every 15K and the oil is disgusting by then and the smell of it is something else. That is with a full synthetic which our trucks do not have in them. The first oil change I do at 1000 miles or less to flush out the sand etc. that is left over from manufacturing the engine.