Spark plugs

Asked by Feb 17, 2016 at 11:46 AM about the 2004 Pontiac Grand Prix

Question type: Maintenance & Repair

What spark plugs are best , platinum,iridium, or
copper

3 Answers

222,595

Most newer cars use the Platinum plugs. Better is subjective. The difference between the three types are how long they wear and last. Copper being 30-60K, Platinum around 100K and Iridium longer. Of the course the costs reflects that.

50

Sometimes cars don't like the platinum plugs. How old is the car and what model? If it has a larger engine say like in a Jeep 6 or 8 cylinder then use the platinum. Smaller older cars do better with copper plugs. Have owned both so I just go with the engine size and the age. Just my 2 cents.

46,595

Double platinum plugs can last a 100k miles but not the single platinum plugs.

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