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

254,235

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.

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70

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.

1 of 1 people found this helpful.
76,625

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

1 of 1 people found this helpful.

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