The scheduled maintenance for this car makes no mention of changing the spark plugs, but for cars that routinely tow, it says you should change the plugs every 30k miles.
I had read several years ago that plugs today are really good, and that you could go 100k miles on them (or more) but they get to be very difficult to remove if you wait that long to switch them out, so consider switching them out sooner than that.
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