Why Do NGK Plugs Have Two Numbers?
Many spark plug brands, including NGK, have two different ID numbers assigned to spark plugs...
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How Do I Find a Colder or Hotter Plug?
Each spark plug has a unique heat range. How can you find a plug that is a hotter or colder heat range?...
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Can I Use Platinum, Iridium or Ruthenium Plugs with Nitrous Injection?
Iridium - yes. Platinum - no. Ruthenium - maybe...
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How Long Do NGK Iridium Plugs Last?
NGK IX Iridium plugs are given a life expectancy of 40-50k miles, while their OEM Laser Iridium plugs typically last 80-100k miles...
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Wasted Spark Ignition Systems
Does a wasted spark ignition system require special spark plugs?
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