Parts for your 2006 Subaru Impreza-Oil pump

2006 Subaru Impreza oil pump — what it is, what it does, and when to sort it

Technical sources confirm the 2006 Subaru Impreza absolutely uses an engine oil pump. The Subaru factory service manual for the 2006 Impreza (Engine Lubrication/LU section, available via Subaru’s Technical Information System) details oil pump removal, inspection and installation. Subaru’s Electronic Parts Catalogue likewise lists an “Oil Pump Assy” for 2006 Impreza models (commonly in the 15010AA3xx family, pump sizes vary by engine). These references make it clear the oil pump is a standard, front-mounted, crankshaft-driven gerotor/trochoid unit on EJ-series engines (EJ253, EJ255/257 in WRX/STI).

For this model, the oil pump’s job is simple but critical: pull oil from the sump, pressurise it, and feed it through galleries to bearings, camshafts and turbo (where fitted). It keeps friction down, carries heat away, and helps the engine last the distance.

While the pump itself is robust, age, high kilometres, seal hardening, or debris can reduce pressure. Many owners get the pump checked whenever the timing belt is off, because the pump sits behind the crank sprocket. On Aussie and Kiwi vehicles that’s typically around the timing belt interval, and it’s a perfect time to reseal or replace the pump if needed without doubling up on labour.

• Common signs of trouble: low oil pressure warning at idle, rattly cold starts, ticking lifters, or fresh oil weeping at the pump-to-block joint.
• Good practice during servicing: inspect the pump cover for scoring, verify rotor clearance, replace the pump O-ring, reseal the housing with the correct anaerobic sealant, and fit a new front crank seal.
• Turbo models: double-check the correct pump size by VIN, turbo EJ engines often run larger pumps than naturally aspirated variants.

If the dash light flickers or pressure seems off, don’t keep driving. A quick mechanical gauge test will tell the truth, and a fresh pump or reseal is far cheaper than bearings. If replacing, go genuine or a quality OEM-equivalent, prime the pump with clean oil during install, and torque fasteners to spec from the Subaru manual. For high-kilometre cars, pairing a pump reseal with a new pickup O-ring and a look at the pickup tube isn’t a bad shout either.

A healthy oil pump means quieter starts, stable pressure, and peace of mind under the bonnet of a 2006 Impreza, whether it’s a daily 2.5i or a WRX on weekend runs.

Popular questions

How often should the oil pump be replaced on a 2006 Subaru Impreza?
It’s not a scheduled replacement item. Instead, have it inspected whenever the timing belt is off. Replace or reseal if there’s wear, scoring, low pressure, or oil leaks at the pump. Many workshops take the opportunity at timing belt time to reseal and fit a new front crank seal and O-ring.

What are the symptoms of a failing oil pump on a 2006 Impreza?
Look for a low oil pressure light at idle, tapping on cold start, valve-train noise, or light knocking under load. You might also spot oil seeping from the pump area. Confirm with a mechanical gauge before driving further to avoid bearing damage.

Do turbo and non-turbo 2006 Imprezas use the same oil pump?
Often not. Naturally aspirated EJ engines typically use a smaller rotor pump than WRX/STI turbo engines. Always check the specific part number by VIN or engine code to ensure the correct pump and gasket set are fitted.