The Uplander is coming up on an oil change and I was planning on staying withQuaker State Ultimate Durability and a Tough guard. Its consumed oil for a while now and Ive came to the conclusion that its about a quart every 2500-3500 miles. Ive considered High Mileage oils but I dont want to have the engine become dependent on them. I know they are a little thicker which might be a plus to slow consumption, I just dont want to mess up any seals with the additives that are in them. Anybody use High Mileage oils LONG TERM with no ill effects? It almost seems in the back of my mind that they are gimmicky. How exactly do they work? Do they really reduce wear better than "regular" oil? The main goal here is to slow or stop the consumption. Would I be better off staying withQuaker State Ultimate Durability or move to a High Mileage? And which one if so, Thought of MaxLife and Defy. I dont want any additives that swell seals, and I dont want the oil do be thick like a Lucas additive. I dont see much on this site about High Mileage oils. Just wondering LONG TERM if it would be better to switch to a High Mileage now or stay with synthetic Quaker State Ultimate Durability.