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M5 E39 2001
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14 Posts
Discussion Starter · #1 ·
Hi guys!

Im changing spark plugs and some other stuff as we speek. Got this brilliant idea to check through the spark plug holes with an endoscope..Daaah :( and found this in cylinder 6:

Output device Computer Gadget Communication Device Audio equipment


Seems pretty toasted to me? I’m guessing my maintenance worl this winter doesn’t stop with just spark pligs and valve cover gaskets…

Notes: The engine has 100k miles and runs fine.
 

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161 Posts
I might be missing something but that looks like normal carbon build up to me. Unless you're running E85, the piston tops will have carbon.
 

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M5 E39 2001
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14 Posts
Discussion Starter · #4 ·
Thanks guys for your answers! :)

Maybe I was overthinking it, but I tought there was some material missing from the top left at the piston
 

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2,021 Posts
Normal level carbon buildup. Nothing to worry about.
 
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