Parts for your 2010 Subaru Forester-Oil pump

2010 Subaru Forester oil pump — what it does and how to look after it

Based on technical references, the 2010 Subaru Forester does use an oil pump and it’s absolutely relevant to servicing. The Subaru Factory Service Manual for the 2010MY Forester (EJ25 engine, Lubrication section) specifies a crankshaft-driven trochoid/gerotor oil pump mounted at the front of the engine. Subaru’s parts catalogue also lists a complete oil pump assembly, rotor set, relief valve and seals for the 2010 Forester’s EJ25 variants (both naturally aspirated and turbo). So, yes — this Forester is fitted with an oil pump from the factory.

The oil pump’s job is to circulate engine oil under pressure to bearings, camshafts and timing components, and to help manage temperature and friction across the whole engine. On the EJ25, it lives behind the crank pulley in the front cover, drawing oil from the sump through a pickup and pushing it through the filter and galleries. A built-in pressure relief valve keeps things in check, so pressure stays within spec across cold starts, hot drives and long motorway runs. Without a healthy pump, low oil pressure can quickly lead to noisy lifters, timing irregularities and — in the worst case — bearing damage.

For owners, the best “maintenance” for the oil pump is sticking to quality oil and filter changes at the intervals in Subaru’s schedule (shorter intervals if doing lots of short trips, towing or outback work). During timing-belt service (which the 2010 EJ25 has), it’s smart to inspect the pump area for seepage, check the front main seal, and make sure the pickup and O-ring are in good nick. Actual pump replacement isn’t routine, it’s considered when verified low oil pressure persists after ruling out thin/old oil, a blocked pickup, a failing pressure sender, or big-end/cam clearance issues. If a pump does need swapping, a workshop will remove the belts and front covers, pull the pump, fit a new O-ring, apply the correct sealant where specified in the manual, torque fasteners properly and prime the pump with clean oil before first start.

• Watch for an oil warning light flicker at hot idle, fresh leaks at the front cover, or rattly top-end on cold starts.
• Use the correct oil grade for local climate and driving, and a reputable filter with a good anti-drainback valve.
• If in doubt, have oil pressure checked with a mechanical gauge before calling the pump faulty.

Does the 2010 Subaru Forester have an oil pump?

It does. The EJ25 engine in the 2010 Forester uses a crank-driven trochoid oil pump located in the front cover. This is documented in the Subaru Factory Service Manual for the 2010MY Forester and confirmed by Subaru’s parts catalogue listings for the oil pump assembly and related seals.

When should the oil pump be replaced?

Replacement isn’t a routine service item. It’s considered if confirmed low oil pressure remains after checking oil quality/level, the pressure sender, filter, pickup and clearances. Many workshops will inspect for leaks and pump wear during timing-belt service because access is already open.

Can a competent DIYer replace the pump at home?

It’s advanced DIY. The job involves removing the crank pulley and timing belt, handling sealant correctly, priming the pump and torquing fasteners to spec. If any step is missed, the engine can suffer low oil pressure on restart. Most owners leave this one to a workshop with Subaru experience.