My son has a '92 Mazda Miata, and the manual calls for the aluminum washer on the oil pan drain bolt to be replaced every 5-6 oil changes. Seems it's a crush washer, and is meant to deform a bit to allow a good seal.
I would expect the same goes for the Honda. If your Honda dealer has them in stock, this may be the case.
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Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.