Parts for your 2020 Subaru Legacy-Oil pump

2020 Subaru Legacy oil pump — what it does, when to worry, and how it’s serviced

Yes, an oil pump is absolutely fitted to the 2020 Subaru Legacy. Both engines offered that year—the 2.5‑litre FB25 and the 2.4‑litre turbo FA24—use a crankshaft‑driven, gerotor (trochoid) oil pump integrated into the front timing cover. This is documented in Subaru’s Factory Service Manual for the 2020 Legacy/Outback (Engine Lubrication section) and confirmed by Subaru’s OEM parts catalog, which lists the complete Oil Pump Assembly and related seals as service parts.

The oil pump’s whole job is to pull oil from the sump and push it under pressure through the galleries to bearings, camshafts and the timing hardware, keeping friction down and heat under control. On these FA/FB engines, the pump also houses a pressure relief valve that regulates system pressure, so it’s central to engine health.

As far as servicing goes, the oil pump isn’t a routine replacement item. What is routine is looking after the oil that it moves. Subaru specifies full‑synthetic oil of the correct grade (typically 0W‑20