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Replace sealing ring (2).
Parts:
Sealing ring
Position oil drain plug (1) on the oil sump and tighten.
TIGHTENING TORQUE SPECIFICATIONS
Oil drain plug
M12x16 Replace the sealing ring.
Tightening torque
25 Nm
Courtesy of BMW OF NORTH AMERICA, INC.
Position service cap (1) and rotate it anti-clockwise and lock it in place.