When & How To Change Spark Plugs (DIY) | Family Handyman
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WebFeb 14, 2019 · When to Check & Change a Spark Plug. Not all spark plugs are rated for 100,000 miles. In fact, some carmakers recommend replacement at 30,000-mile intervals. Always follow the spark plug service intervals shown in your owner’s manual to figure out when to replace spark plugs. But if you can’t remember when you last changed your …
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