Blown head gasket?
The spark plugs on my Sebring Convertible 06
seem to have a black liquid (which looks a lot like
engine oil) when I pull them out. There is probably
engine oil leaking into the well. Because no check
engine light has come one I haven't assumed that
this is a serious problem. About two months ago I
filled the engine oil level to the highest mark
because it was at the lowest, and now it is back to
about a quarter of the way between the low and
high oil level. Is this a problem worth taking the
engine apart? What should I look for when I do?
Most likely the spark plug well seals are leaking, they can be purchased separately or in a valve cover gasket kit. You labeled this blown headgasket, a blown headgaskets usual sign is coolant in the oil or oil in the coolant, some vehicles will have a slight engine miss when first started and blow white smoke out of the exhaust and you will also notice that it keeps using coolant with no external sign of a coolant leak.
Thanks for the correction. So the oil seems to be in the combustion chamber, although car is running fine and I have no problem with misfires. How did it get in there? The rubber cover is always completely dry when I take it out and the electrodes look normal.
Check the PCV system, make sure the valve is operational and the clean air inlet is not plugged, if all that checks good then there are a number of mechanical problems that can cause this, valve guide seals, valve guides, piston rings, worn or scored cylinder walls.
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