The 2024 owner's manual said spark plugs last 100k, then my 40k service bill showed up

I was flipping through the glovebox manual of my 2022 truck last Saturday and it clearly says iridium plugs are good for 100,000 miles. But I called the dealership in Des Moines to get a quote on the 40k service and they listed spark plug replacement as a required item. That is a $340 upsell for parts that are nowhere near worn out. I asked the service writer about it and he just said 'it's manufacturer recommended' with a straight face. Has anyone else caught this kind of gap between the printed manual and what dealers push? Is there a reason to trust the manual over the shop's checklist?

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