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International Automotive Technicians Network
Re: when to replace spark plugs?
Posted to Technical Discussion Forum on 8/24/2006

Well John,

Here's what we recommend here.

Conventional spark plugs: Replace at 30,000miles.

Platinum and Iridium Spark Plugs: Replace at 60,000miles.

Disclaimer: The following is My Opinion. Based on conjecture and observation WITHOUT controlled scient... Login to read more.