Vehicle is a 2007 Audi Q7. 3.5 liter VR6 engine, holds (and was previously refilled with) 6 quarts of VW-spec synthetic oil. Filter was definitely changed at the last oil change because we did that one, too. The filter was almost entirely plugged with sludge; there was so much in the filter cap that I had to clean it out in the parts washer. The drain plug for the filter cap barely flowed because it was plugged with the stuff. And the oil pan is coated real thick now. The top end of the engine is likewise packed in this thick, nasty crap. Last oil change was just under 15,000 miles ago.
Change your oil and filter at 5,000 miles.
Change your oil and filter at 5,000 miles.