R56 what is my old spark plug telling me?
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what is my old spark plug telling me?
I just changed out the spark plugs on my 09 mcs. It has 75k miles on it.
I noticed one of them is significantly darker than the other three.
And the tip has burn mark and others doesnt.
Do I have to worry?
I noticed one of them is significantly darker than the other three.
And the tip has burn mark and others doesnt.
Do I have to worry?
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