Engine Oil Drain / Sump Plug, M18 x 1.5. Porsche 986 / 987.1 / 996 / 997.1 / 964 / 993 › 90021900930

OE Match engine oil drain / sump plug with an M18 x 1.5 thread for the Porsche Boxster, Cayman and Carrera applications detailed below. Additional crankcase and turbocharger oil-system uses are identified in the supplied diagrams.

Fits:

• Boxster 986 2.5L 1997–99
• Boxster 986 2.7L 1999–02
• Boxster S 986 3.2L 1999–02
• Boxster 986 2.7L 2003–04
• Boxster S 986 3.2L 2003–04

• 996 C2 3.4L 1997–08/01
• 996 C4 3.4L 1997–08/01
• 996 C2 3.6L 09/01–2005
• 996 C4 3.6L 09/01–2005
• 996 C4S 3.6L 09/01–2005

• Boxster 987 2.7L 2005–08/08
• Boxster 987 S 3.2/3.4L 2005–08/08

• Cayman S 3.4L 987C 2005–08
• Cayman 2.7L 987C 2006–08

• 997 MK1 Carrera 2 3.6L 2005–08
• 997 MK1 Carrera 2S 3.8L 2005–08
• 997 MK1 Carrera 4 3.6L 2005–08
• 997 MK1 Carrera 4S 3.8L 2005–08

What This Product Does
The threaded plug closes the engine's oil-drain opening and is removed when draining oil during servicing. It works with a separate sealing washer to seal the joint. Other documented applications use this reference as a screw plug rather than necessarily as a sump drain.

Functions

• Closes the applicable threaded oil-system opening.
• Allows access for oil drainage in sump applications.
• Provides a seating point for the separate sealing washer.

Technical Details

• Reference: 90021900930; thread: M18 x 1.5. Supplied recommended tightening torque: 25–30 Nm; confirm the procedure for the specific application.
• 986 Boxster crankcase, 1997–04: Diagram: 101-05, item 27. 996 Carrera 2/4/4S crankcase, M96.01/02/03/04, 1998–05: Diagram: 101-05, item 26.
• 997.1 crankcase, 2005–08: M96.05 3.6L COUPE / CABRIO and M97.01 3.8L CABRIO S / COUPE S. Diagram: 101-05, item 24.
• 964 right crankcase, 1989–94, and 993 right crankcase, 1994–98: Diagram: 101-10, item 21.
• 993 turbocharger oil-pump assembly, 1994–98: Diagram: 202-16, item 11; diagram quantity: 2. 996 Turbo right crankcase, 2001–05: Diagram: 101-10, item 26.
• 996 GT3-1 M96.76, 2000–01, and 996 GT3-1/GT3 RS M96.79, 2004–05, right crankcase: Diagram: 101-10, item 32.

Symptoms of Fault

• Oil seepage localised around the plug or washer.
• Drips beneath the engine or oil on the undertray.
• Damaged threads affecting secure installation.

Why Replacement Matters
A damaged plug can prevent the drain opening from sealing correctly. Inspect the plug, washer and mating threads before replacing parts: a new plug will not correct damaged sump or crankcase threads. After fitting, clean the surrounding area and check for fresh leakage.

FAQs

Is the sealing washer included?
No. Order the recommended new crush washer separately using reference 90012310630/2.

Does this reference have other uses?
Yes. The diagrams also identify crankcase and turbocharger oil-system positions. Match the intended position as well as the vehicle before fitting.