you can't order direct from NGK, unfortunately. you have to order from one of their "authorized retailers".
https://ngksparkplugs.com/en/about-us/where-to-buy
seems Rockauto has the best price, but they aren't an authorized retailer so they could be counterfeit.
what's with all the different spark plug part numbers? Honda says DILKAR8P8SY . i think that's the Japanese part number though. NGK America says 92411 for the Si (0.030" gap) . is that correct?
they would be the same? or do I need to order direct from Honda?
I've heard of others having similar issues with Amsoil MTF. i'd drain it and use Honda MTF. I use it and fluid always comes out looking brand new, even with 20k miles on it. no metal flakes (unlike my past cars which always had some gunk on the drain plug)
people like to hate on the extended warranties saying they're a ripoff and will deny everything . but my 150k aftermarket warranty already paid for itself.
surprisingly, they didn't give me any trouble. they just said they agreed that it has slop.
this time it was out of warranty (second steering rack replacement. first one at 18k miles), but had an aftermarket warranty, so had to get them to approve it. which they did. glad i bought one.