Subaru OEM 12mm Oil Pump Subaru WRX / STI / Legacy GT / Outback XT 2002-2021 | 15010AA320

Overview

This Genuine Subaru OEM 12mm oil pump (Part #15010AA320) is the factory-spec unit designed for Subaru 2.5L EJ engines found in the WRX, STI, Legacy GT, and Outback XT. Built to exact OEM tolerances, this pump delivers reliable oil pressure and long-term engine protection — making it the definitive choice over aftermarket alternatives. It is strongly recommended to replace the oil pump whenever performing a timing belt service or any internal engine work, ensuring your rebuild is done right the first time.

Important 2.0L Conversion Note: This pump is required when converting a 2.0L platform (WRX) to an STI shortblock. The 2.0L oil pump is not compatible with the 2.5L block and must be replaced with this unit.

Key Features & Benefits

• Genuine Subaru OEM Part — Exact factory replacement engineered to meet Subaru's original design specifications, ensuring reliable oil pressure and engine longevity.
• 12mm Rotor Design — Higher-volume 12mm pump rotor provides improved oil flow compared to the standard 2.0L unit, critical for 2.5L EJ engine health.
• Precision Fit — Designed specifically for the 2.5L EJ engine family; no modifications or adapters required for compatible vehicles.
• Essential for Timing Belt Service — Replacing the oil pump during timing belt intervals is strongly recommended to prevent catastrophic engine failure from a worn pump.
• Required for 2.0L-to-2.5L Conversions — The stock WRX 2.0L pump will not fit the STI 2.5L shortblock; this OEM pump is a mandatory upgrade for engine swaps.
• Factory Warranty Eligible — As a genuine Subaru part, it qualifies for Subaru of America's warranty when installed per official guidelines at a certified dealership.

What's Included

• 1x Genuine Subaru OEM 12mm Oil Pump (Part #15010AA320)
• Note: Seals and hardware are NOT included and must be sourced separately.

Specifications

Installation

Installation of this oil pump requires removal of the timing belt assembly and front engine components. It is strongly recommended to replace this pump during any timing belt service or internal engine rebuild. Professional installation at a certified Subaru dealership is advised to maintain warranty eligibility. Note that seals and hardware are sold separately and should be replaced at the same time for a complete service.

⚠️ DOES NOT INCLUDE SEALS AND HARDWARE

⚠️ WARRANTY NOTICE: Subaru of America will only warranty parts installed by a certified Subaru dealership on a vehicle with a matching VIN. Parts installed outside of a certified dealership or on a non-matching VIN are not eligible for warranty coverage. Use your best judgment when selecting your installation method.