1998 Ford Ranger, 2.5 4-cylinder, manual trans, 114,000 miles. Very clean I'm happy to say. We've had this truck since it had 32k on it (It's my son's now) and it's done a lot of short trips when I drove it so the mileage is low for it's age. Oil change history since I bought it has been mostly Chevron 5w/30 conventional but I've also tried a smattering of other oils along the way, usually a 3k to 4k change interval. I know some would say that's wasting oil, but look at how clean she is!!!