Bit of an eye opener really, but having fitted ( for now ) the old spark plugs from the Coupe which are three prongs affairs, I have run the car now for approx 30mins in total. I wire brushed them up before fitting them. Looked at them yesterday and they are now black!
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1987 Audi Coupe quattro - Clarion Tribute Car
2012 Audi A6 Allroad
2004 Mercedes SLK 350
2017 Mercedes GLA 220
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