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regular copper plugs (suppressor or resistor) 30k miles
single platinum plugs with DIS type I or type II ignition 45k miles
single platinum with distributor (presumably HEI) or COP ignition 60k miles
double platinum plugs 60k miles
iridium plugs 100k to 120k miles, possibly longer
This assumes that you do not have a known or suspected problem with any of your spark plugs
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∙ 16y ago
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How often should you replace your spark plugs?
Every year, or as an when the service requires
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Replace them every 100,000 miles.
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Your spark plug manufacturer would recommend your replacement schedule.
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Depends on the type of spark plugs. Factory plugs around 70 - 100k depending on the condition of the plugs. I would replace the spark plugs out with some AC Delco iridium plugs they will last you 100k+.
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You should replace the spark plugs when your car won't start first time but does eventually.
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6000 miles
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How do you replace the spark plugs on a Peugeot 307?
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