Hello all, I have a question about damp and oily spark plugs. During today’s change of spark plugs I noticed that all candles were heavily dirty and rather moist to oily, especially in the area of the thread. It is striking that all three spark plugs are evenly affected, which surprised me with a vehicle with only 30,000 km on the speedometer. It is probably still about the original candles. I have heard that such a vehicle This could possibly be due to an engine wash, which I did not do myself, but of course you don’t know if what was done before. I had excluded valve shaft seal or piston rings for myself because of the mileage. Does anyone know if you should worry about it and if you can do something about it?