Before I came into possession of this motorhome I believe it ran Ford brand of semi-synthetic. Since I've had it I ran Mobil 1 synthetic through it once. I have now run Chevron Havoline DS full synthetic In the six quart box they sell at Walmart. 5W20 and one 0w20. I run the motorcraft filters because they usually have them at Walmart. Buying the five quart jugs and one extra quart to get six, it is cheaper to get the cardboard box by a long shot. With Fords unfortunately having idiot gauges I can't tell you if it runs any better oil pressure or not.just that it seems to not say check gauges when I first started after it sits for a long time since I've switched over to the 0w20. No I don't need that but I like it anyway
