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