Ladies and gentlemen, I own a BMW F800GT, built in 2017 with 7500km. Unfortunately, I have found that the vehicle obviously loses a liquid, as can be seen in the attached photo. My workshop suspects that the liquid originates from the oil flow of the air filter box. Is this problem known to you and can you tell me further information or solutions for this? It also runs from top to bottom. However, I can’t identify where. Thank you in advance for your support.