Parts for your 2020 Subaru Impreza-Oil pump

2020 Subaru Impreza oil pump — what it does and how to look after it

Per Subaru’s Factory Service Manual for the MY2020 Impreza (FB20 engine) and official Subaru OEM parts catalogues, the 2020 Subaru Impreza is fitted with an engine oil pump. It’s an internal-gear (trochoid) pump driven directly off the crankshaft and housed at the front of the timing case. Those technical sources list the pump assembly, pressure relief valve and related seals as serviceable components, so yes — the oil pump is absolutely relevant and used on this model.

The oil pump’s job is simple but critical: pull oil from the sump and push it under pressure through the galleries to crank and cam bearings, the timing chain, and the AVCS (variable valve timing) system. That pressurised oil builds a protective film that keeps metal from touching metal, helps carry away heat, and moves contaminants to the filter. Cold starts, hot traffic crawls, long motorway stints — the pump keeps lubrication on song so the FB20 runs smoothly and efficiently.

For everyday servicing, the smartest “oil pump maintenance” is really oil system maintenance. Stick to Subaru’s local schedule — typically every 12 months or 12,500 kilometres in AU/NZ conditions — using the correct grade (commonly 0W-20 meeting the latest API spec) and a quality filter. Clean oil protects the pump’s tight clearances and keeps the pressure relief valve happy. Keep an eye out for leaks around the front cover, and don’t ignore a flickering oil pressure lamp or new engine noises under the bonnet.

The oil pump isn’t a regular replacement item and should last the life of the engine if serviced properly. Replacement is considered when verified oil pressure is out of spec, there’s internal wear, or debris has gone through the system. A good workshop will first confirm pressure with a mechanical gauge, check for fault codes related to valve timing, and inspect the pickup and O-rings if the sump is off. If the pump needs to come out, expect front-end engine disassembly: crank pulley removal, timing cover off, meticulous cleaning and resealing, new front crank seal, and priming the pump with clean oil on reassembly. After refilling with roughly 4.5–5.0 litres of the correct oil, they’ll check for leaks and confirm hot-idle pressure at spec — no dramas.

• Warning signs: low oil pressure light (especially at hot idle), rattles on start-up, VVT/AVCS faults, or metallic debris in the filter.

FAQs

Does the 2020 Subaru Impreza actually have an oil pump?
Yes. Subaru’s service documentation for the FB20 engine and OEM parts listings both show an internal-gear oil pump mounted in the front timing case and driven by the crankshaft.

When should the oil pump be replaced?
There’s no routine replacement interval. It’s only replaced if verified oil pressure is below spec or the pump is worn or damaged. A workshop will gauge pressure, check for AVCS-related faults, and inspect the pickup and seals before recommending a new pump.

What maintenance helps the oil pump last?
Regular oil and filter changes with the correct grade, using quality parts, and fixing leaks promptly. If the sump is ever off, replacing the pickup O-ring and checking the pickup screen helps safeguard pump performance.