Hello, how does a defective crankcase ventilation express itself? I noticed a few drops of oil under the vehicle today. Around the oil filler lid are some oil noses, which could explain the drops. When I opened the lid (in idle mode) carefully, it opened very slightly absorbent. Should this light vacuum be like that? The vehicle is a gasoline, 740Li, FL. Valve cover seal and lid was changed about 6 months ago, so it’s not that. Thank you and greeting.