Genuine OEM BMW Sechskantschraube mit Washer, part number 07119903994. This is a hex bolt with an integrated washer, also known as 'Sechskantschraube mit Washer' in German, used for the oil cooling pipe. It provides a secure fastening point for the pipe. Genuine OEM parts ensure the correct thread pitch, material strength, and corrosion resistance for reliable oil cooling system performance.