Heyo, recently changed the candles during the oil change (were not 30,000 km in it). 3 pieces don’t look like they should. The candles are Beru Ultra’s. Have already controlled the websites of Beru and NGK, because there are also diagnostic aids with pictures offered there. However, both sides give quite different information about the appearance of my spark plugs. Therefore, I hope a little competent help here. Where could this come from? Did the candles exactly in the penultimate oil change. At that time I had taken the 5W40 HC oil from Castrol (“Dynatec 7” or something). Since the last oil change, however, I am back to the fully synthetic 5W40 Liqui Moly Synthoil-Hightec. But I don’t know if the oil itself is so crucial.