They have been in my GMC Sierras V8 for about 7 months now. The truck runs great with it. However, I did not notice any difference to the old original spark plugs after replacing the 11 year old factory spark plugs with these. The truck ran great then and drives great now. I changed the spark plugs to save fuel. My GMC Sierra still burns a lot of gas and still won't drive past a gas station without wanting to stop. Revain also has the best deal on these candles.
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