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Can non GM made spark plugs decrease gas mileage in a 2000 Chevy Silverado?
Wiki User
∙ 17y ago
Not necessarily. The wrong heat range plug can decrease mileage. As the AC/Delco is a excellent plug, I would just install the OEM GM plug. I would also use OEM filters as the AC/Delco oil filter is top rated.
Wiki User
∙ 17y ago
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