Subaru OEM Oil Drain Plug Crush Washer 11126AA000 – EJ Engines

It’s a $2 part that decides whether your garage floor stays clean.

The OEM 11126AA000 crush washer is the factory-spec drain plug gasket for Subaru EJ engines. Soft aluminum. Correct thickness. Designed to deform once, seal properly, and be replaced every oil change. Simple. Effective. Not optional.

Key Specifications

• OEM Subaru part number: 11126AA000
• Material: Aluminum
• Designed for single-use crush sealing
• Fits factory Subaru oil drain plugs
• Correct inner and outer diameter for EJ oil pans
• Sold individually

Why This Washer Works

The seal on your drain plug doesn’t come from torque alone — it comes from controlled deformation of the washer.

When tightened to spec, this aluminum washer compresses evenly against the oil pan and plug surface, creating a proper seal without overloading the threads. Reusing old washers or running generic hardware-store substitutes is how you end up overtightening plugs, damaging pans, or chasing slow leaks.

On EJ engines, especially older aluminum pans, thread integrity matters. This washer helps protect it.

Replace it every oil change. No shortcuts.

Ideal Use Case

• Routine oil changes
• Street-driven WRX / STI
• Track-prepped EJ builds
• Fresh engine installs
• Anyone who prefers doing it once, correctly

If you’re already under the car, this is cheap insurance.

Fitment

Compatible with most Subaru EJ-series engines including:

• EJ20
• EJ205
• EJ207
• EJ25
• EJ255
• EJ257

Commonly fits:

• 2002–2014 WRX
• 2004–2021 STI (EJ models)
• Forester XT (EJ turbo models)
• Legacy GT (EJ turbo models)

Always confirm drain plug style and application before ordering.

For Subaru WRX and STI EJ20 and EJ25 engines, the OEM 11126AA000 crush washer ensures proper oil drain plug sealing during routine maintenance. A small component that protects threads, prevents leaks, and keeps your oil service done right.