Seal screw union at the oil pressure duct.

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If the hexagon-head bolt (arrow) was loosened, the micro-encapsulated hexagon-head bolt must always be replaced.

Part number 900.378.163.09 (M6 x 16)

Fig 1: Identifying Micro-Encapsulated Hexagon-Head Bolt

Courtesy of PORSCHE OF NORTH AMERICA, INC.