If you're willing to DIY it's easy to find out; the plugs are very easy
to get at. I have almost 180k on my 2003 Elantra. IIRC I've changed
the plugs at least three times and they certainly needed it (worn
electrodes, out of spec gap, etc).
They may go longer, but given the cost and the fact that winter is
coming, do you want worry about saving a few bucks? If you live in a
cold climate, I'd do it soon rather than when it is hard starting at 4
Everything mechanical eventually wears out. Your plugs will eventually
lose some of their sparking ability. It may be slow and gradual and you
can plan to change them. It may be sudden when it is 10 below zero and
your car won't start. For that reason, at some point I'd change them.
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