Parts for your 2018 Subaru Impreza-Oil pump

2018 Subaru Impreza oil pump — purpose, maintenance, and replacement tips

Based on technical sources, the 2018 Subaru Impreza absolutely uses an engine oil pump. The Subaru Factory Service Manual for the 2017–2019 Impreza (FB20), Subaru’s Technical Information System (STIS), and the Subaru genuine parts catalogue all list the crankshaft-driven, positive-displacement oil pump as a core engine component. On the FB20, the pump is integrated at the front of the engine and supplies pressurised oil to bearings, camshafts, chains and control solenoids.

What does it do? The oil pump pulls oil from the sump and pushes it through the filter and galleries, keeping friction down, temperatures stable, and wear in check. It also maintains the oil pressure that the warning lamp on the dash is watching. Without it, an engine won’t last minutes — so it’s a critical bit of kit on any Impreza doing the daily commute or the long Kiwi and Aussie road trips.

There’s no fixed replacement interval for the pump itself, it’s designed to outlast the engine when serviced properly. The best protection is simple: regular oil and filter changes using the correct grade (typically 0W-20 meeting Subaru spec for the FB20), and avoiding low-oil situations. Clean oil reduces varnish and wear inside the pump and its pressure relief valve.

If the car shows any of the following, a workshop check is wise:

• Oil pressure lamp flickering at idle, especially when hot
• Rattly cold starts or persistent valvetrain/chain noise
• Metallic debris found during an oil change
• Noticeable drop in oil pressure on a scan tool or gauge

When replacement is needed (usually after bearing damage, severe wear, or frontal leaks), a technician will remove the crank pulley and front covers to access the pump. Good practice includes inspecting the pickup and O-ring, checking the relief valve for free movement, priming the pump with clean oil during install, and using the specified sealant and torque values from the Subaru workshop manual. It’s also smart to replace the front crank seal while you’re there. After refit, a pressure check and a careful first start confirm the system is happy.

For most owners, sticking to on-time services, using quality oil and filters, and keeping an eye on any warning lights is all it takes to keep the 2018 Impreza’s oil pump doing its job quietly in the background for hundreds of thousands of kilometres.

Popular questions about the 2018 Subaru Impreza oil pump

Does the 2018 Impreza actually have an oil pump, and where is it?
Yes. The FB20 engine uses a crank-driven, positive-displacement pump mounted at the front of the engine behind the crank pulley. It’s part of the front cover assembly and feeds the entire lubrication system.

When should the oil pump be replaced?
There’s no routine interval. It’s generally replaced only if there’s confirmed low oil pressure, internal wear or scoring, a stuck relief valve, or during an engine rebuild. A trustworthy workshop will diagnose pressure properly before recommending a new pump.

What are the warning signs of a failing oil pump?
A flickering oil light at idle, noisy starts, persistent top-end ticking, or verified low pressure on a gauge are red flags. Always stop the engine if the oil light stays on — continued driving can cause major damage.