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Your Silverado came factory equipped with premium spark plugs designed to be efficent for 80,000 miles. Replace them sooner if you have neglected regular service of engine filters and oil changes, drive in dusty conditions, live in an extreme climate, or do a number of short trips which do not allow the engine to reach operating temperature, or if you have experienced sub-standard quality gasoline. The AC brand plugs you put in will be a Platinum plug, and should give another 80,000 miles service.

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17y ago

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