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That really depends upon the type of spark plugs that are in your vehicle. Vehicles 15+ years old are more likely to have standard plugs with approximate life expectancy of 12,000-15,000 miles. Newer model vehicles up to 2000 are usually platinum tipped, lasting approximately 30,000 miles. Some 2001 and newer vehicles come with iridium tipped plugs which could last up to 90,000 miles.