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The OEM sparkplugs are the Denso twin-ground electrode variant. They are designed to last up to 60,000 miles before needing replacement. Depending on driving conditions and maintenance history - plug life can vary considerably, most see changes anywhere from 30,000 to 60,000 miles.

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15y ago
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Q: How often do you need to replace the spark plugs in a 99 corolla?
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