Silverado_Ed Posted August 18, 2020 Report Share 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 Link to comment Share on other sites More sharing options...
someotherguy Posted August 18, 2020 Report Share Posted August 18, 2020 The GM specified plug is an AC Delco iridium plug claimed 100K+ miles, part # 41-985 Richard Quote Link to comment Share on other sites More sharing options...
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