Subaru JDM Tokyo Roki Oil Filter Subaru EJ20 / EJ25

If you’re still running bargain-bin filters on an EJ, we need to talk.

The Tokyo Roki 15208AA100 is the OEM supplier filter used on JDM Subaru applications. Proper bypass pressure, correct anti-drainback valve, and media designed for high-revving flat-fours. It’s the filter these engines were engineered around — not an afterthought.

When you’re spinning 7,000+ rpm and oil temp is climbing, the details matter.

Key Specifications

• OEM part number: 15208AA100
• Manufacturer: Tokyo Roki (OEM Subaru supplier)
• Designed for EJ20 / EJ25 engines
• Factory-spec bypass valve pressure
• High-quality cellulose/synthetic blend filter media
• Silicone anti-drainback valve
• Steel canister construction
• Standard Subaru 65mm filter size

Why This Filter Works

EJ engines rely on stable oil pressure and consistent flow, especially under sustained boost or track use. The internal bypass pressure on this filter matches what the factory oiling system expects. That means no premature bypass at high RPM and no unnecessary restriction when cold.

Cheap filters can collapse media, bypass too early, or use weak anti-drainback valves that cause dry starts. None of those are things you want in a horizontally opposed engine with tight bearing clearances.

This one simply does what it’s supposed to do — every time.

Ideal Use Case

• Daily-driven WRX or STI
• Street-tuned EJ builds
• Track day cars
• Mild to moderately built engines
• Anyone who prefers OEM-engineered oiling components

If you’re chasing reliability and stable oil pressure, this is the safe play.

Fitment

Fits most Subaru EJ-series engines including:

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

Compatible with many:

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

Always confirm application before ordering.

For Subaru WRX and STI owners running EJ20 or EJ25 engines, the 15208AA100 Tokyo Roki oil filter remains a trusted OEM solution for street, track, and tuned applications. When oil control matters, factory-spec filtration is the smart move.