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The only application I'm aware of is some new domestics that use it - ford, gm, probably for fuel economy. You need some tight clearances in your engine to run this kind of thin oil. I'm not yet aware of any hondas needing it though.
At least for the 03 Accords, 5W20 is all that's spec'ed in the manual, since Mobil only makes a 0W20, that's what I'm planning on running. Ford is the only other make to spec a 5W20, as far as I know.