Ok, I've got a 99 Durango with the 5.2L (318) V8 and selectable 2wd/awd/4wd. It's got 168,000 miles on it right now. My parents bought it new and I've had it for the past 6 years and ~60k miles. My dad always changed the oil every 3,000-4,000 miles with Wolf's Head 10w30 and a bottle of STP...