{Chrysler 300} oily spark plugs

["Henry A. Mitchell III" <hamlll@xxxxxxxxxxxxxx>]

 

 

I have a 300C. The engine runs well, starts right up. I noticed a little soot in the tailpipes, so I pulled the spark plugs. There is oil on the threads, the bottom rim of the plug is shiny sooty black and the ceramic insulator is dark brown. The electrode tips are a milk chocolate brown (except for no.1). There was oil inside and outside the spark plug tube and there was a lot of oil in the well of the head that the spark plug tube slides into. The first photo attached is with a new plug in the background to get a color reference.

The spark plug crush washer has been removed (at the recommendation of the Chrysler manual) and the plugs torqued to 32 ft.lbs.  Is there a way to seal the tube so that oil doesn’t get down into the bottom of the tube and the plug?

Also, now that the cylinder chamber may have a lot of carbon, is there a recommendation for one of those carbon cleaner fuel additives?

 

Thanks, California Henry

                           300C

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