Richard I will have to disagree with you. I work on a fleet 5.4 Ford Vans 3 Oil changes today approx 4500 miles since last change. all vans approx 90/100K miles. Van #1 Full, Van #2 1/2 Quart low. Van #3 2 Quarts low. The Vans in my fleet all have oil changed ... Login to read more.