Silverado_Ed Posted August 18, 2020 Report Posted August 18, 2020 I am being told I need to use 150,000 mile spark plu8gs for my 2003 SS Silverado 6.0 liter engine... Is there such a thing? And if so what are they? Quote
someotherguy Posted August 18, 2020 Report Posted August 18, 2020 The GM specified plug is an AC Delco iridium plug claimed 100K+ miles, part # 41-985 Richard Quote
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