"10,000 mile oil change interval" written by the same company that wants to sell you another new vehicle.
My oil catch pan is an old white refrigerator vegetable crisper pan and the difference in the black sludge from my 3,000 mile old oil to my daughter's 5,000 mile old oil was significant. A product of combustion is carbon and that is harder than engine parts, so I suppose that I'm "wasting money" to get rid of the dirt by buying new oil and filters according to the manual. The only wear that I've ever seen on my vehicles is on the drain plug.
