Parts for your 2015 Subaru Exiga-Oil pump

2015 Subaru Exiga oil pump — what it does and how to look after it

Yes, the 2015 Subaru Exiga uses an engine oil pump. That applies to both common engines fitted to this model year: the FB-series 2.5-litre (chain-driven) and the EJ-series 2.0-litre turbo (belt-driven) used in Exiga GT variants. Technical sources that document this include the Subaru service manuals (STIS) for the FB and EJ engines, which contain dedicated “Lubrication – Oil Pump” sections, and the Subaru FAST electronic parts catalogue, which lists the oil pump assembly and related seals and relief components for the Exiga YA platform. These factory publications describe a crank-driven gerotor (trochoid) pump that supplies pressurised oil to bearings, variable valve timing gear, and turbo (where fitted).

On this Subaru, the oil pump’s job is simple but critical: pull oil up from the sump, pressurise it, and push it through galleries to keep the crank, cams, and (on GT models) the turbo healthy. Without good pump performance, oil pressure drops, bearings suffer, and the engine won’t be happy for long. The FB engine integrates its pump into the front cover and drives it directly off the crank. The EJ engine uses a bolt-on front oil pump housing behind the timing belt pulley, also crank-driven. Both setups are proven and robust when fed the right oil and serviced on time.

The pump isn’t a routine replacement item, but it definitely benefits from smart servicing. Fresh, correct-spec oil and quality filters protect the pump’s clearances and the pressure relief valve from varnish or sticking. If the dash oil light ever flickers, there’s cold-start rattling, VVT-related fault codes, or a sudden rise in mechanical noise, a manual oil-pressure test with a gauge is the next step.

For FB-equipped Exiga models, technicians typically inspect for front cover leaks, check pressure against the spec, and only remove the cover (and pump) if there’s a confirmed issue. For EJ-powered Exiga GT models, the pump is easy to inspect during timing belt service (around the usual Subaru belt interval). Best practice is to replace the pump-to-block O-ring, reseal the housing with the correct anaerobic sealant, verify the relief valve moves freely, and check the backplate screws for tightness. Any scoring, excessive rotor-to-housing clearance, or stubborn pressure problems usually means fitting a new genuine pump assembly.

A few simple habits go a long way in Australia and New Zealand conditions: stick to the owner’s manual oil spec and intervals (many FB25s use 0W-20