Mercedes 350 ml spark problem

I got a Mercedes Benz 350 ml from 2010 , and I got 3 sparks that’s keep burning themselves, ive replace them 3 times all ready and the second day after my visit to service they are burnt , what could be the couse of that ??

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MBFanatic made a comment.
1 year 6 months ago

I have never seen burned spark plugs. What do you mean by that? Also which cylinders and what spark plugs are you using?

 

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