Sounds a bit off.. at the same time you can always just wait until 60K. If you get misfiring then spark plugs would really be the first place to look. I just don't see it being a really big deal either way. If they are just trying to strum up business and you aren't going to DIY I wouldn't bother. If it was cheap enough I wouldn't necessarily mind doing it, just wouldn't lose any sleep. You can always call the original dealership and ask what they did for service and their opinions on it.
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