If they are over 60,000-80,000 miles maybe else no reason. They usually last 120,000 or more with a spec of 100,000. Use only OEM equivalent when you do. I didn't and replaced those in 1/4 the distance of the first set (and chased misfire codes for a while not anticipating 25,000 mile plugs to be the cause)

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)