Parts for your 2007 Subaru Forester-Oil pump

2007 Subaru Forester Oil Pump — What It Does and When to Service It

Yes, the 2007 Subaru Forester is fitted with an engine oil pump. Technical references including the Subaru Factory Service Manual (FSM) for the 2007 Forester (EJ253/EJ255) in the Lubrication System section, as well as the official Subaru parts catalogue for EJ25 models, specify a crankshaft-driven internal trochoid oil pump mounted at the front of the engine behind the crank pulley. Independent workshop manuals covering EJ-series engines corroborate the same pump design and location.

On this Forester, the oil pump has one job: move the right amount of oil, at the right pressure, through the engine to lubricate bearings, camshafts and the AVLS/AVCS hardware (model-dependent), and to help with cooling and cleaning. It’s a compact, gear-style (trochoid) pump driven directly by the crankshaft, so it spins any time the engine runs. Without it doing its thing, metal-on-metal contact would quickly cause expensive damage.

Subaru doesn’t list the pump itself as a regular replacement item, but it should get attention during major front-of-engine work. In Australia and New Zealand that’s typically at timing belt services (around 100,000 km intervals, or as per the schedule specific to the vehicle’s market and engine). While the timing covers are off, a good workshop will inspect the pump body and rotors for scoring, check end-clearance, and renew common leak points. Fresh sealant on the pump-to-block face, a new pump O-ring, and a new front crank seal are inexpensive insurance. Priming the pump with clean oil before refitting helps it build pressure immediately on first start.

Practical advice for a 2007 Forester oil pump during servicing:

• Check hot-idle oil-pressure with a mechanical gauge if the warning lamp flickers or lifter/tappet noise is present.
• Inspect for rotor wear, relief valve sticking, or backing plate fasteners needing threadlocker (a known EJ-family precaution in some years).
• Replace the pump if there’s notable scoring, out-of-spec clearances, or erratic pressure that isn’t down to bearings or viscosity.
• Always use the correct oil grade and a quality filter, poor filtration or wrong viscosity can mask pump issues and accelerate wear.

Common signs the pump or its sealing is due some love include a faint rattle on cold start that fades as pressure builds, seepage at the front of the engine, an oil light that flirts at hot idle, or AVCS/AVLS codes on turbo/non-turbo models respectively. Left unchecked, low oil pressure can escalate from mild bearing wear to a full rebuild. Sorting the pump whilst doing the belt saves labour and keeps the EJ humming happily for many more kilometres.

Popular questions about the 2007 Subaru Forester oil pump

How long does the oil pump usually last on a 2007 Forester?
With regular oil changes and a quality filter, the factory oil pump commonly lasts the life of the engine. Many shops only replace it when there’s measurable wear, a pressure problem, or they’re already in there for a major timing service and the pump shows scoring or leakage.

Should the oil pump be replaced during a timing belt change?
Not automatically. It’s smart to inspect it during the belt job because access is ideal. Replace the O-ring and front crank seal, check clearances, and reseal as needed. If wear or poor pressure is found, that’s the time to fit a new pump.

What oil pressure should a healthy EJ25 show?
Exact figures vary with oil temperature and grade, but a healthy EJ25 typically shows solid pressure at cruise and a stable reading at hot idle with 5W-30. If the dash light flickers at idle when hot, confirm with a mechanical gauge and investigate the pump, clearances, and oil viscosity.