Has anyone tried using 10w-40 in the '02 and up 8.1L engines to see if they still use a quart every 1K miles?
My '02 in consistently using 1 qt. every 1K miles, especially when doing more towing of our 32' fifth-wheel. Just added another quart this weekend and that should take it to the next change. Thinking about trying it with
10w-40 next round.