10w-30 vs. 10w-40 in 8.1L

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.
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