Parts for your 2015 Subaru Impreza-Oil pump

2015 Subaru Impreza Oil Pump: What It Does and How to Look After It

Based on technical sources including the Subaru Factory Service Manual for the 2015MY Impreza (FB20 engine, Lubrication section) and the Subaru Genuine Parts Catalogue (Group 15, Oil Pump Assy), the 2015 Subaru Impreza absolutely uses an engine oil pump. It’s a crankshaft-driven internal gear (trochoid) pump integrated into the timing chain/front cover, making it a critical component of the engine’s lubrication system.

On this Impreza, the oil pump’s job is to pull oil from the sump, pressurise it, and feed it through galleries to bearings, camshafts, the timing chain, and other moving bits. That oil film prevents metal-on-metal contact, carries away heat, and helps keep everything clean. Without good oil pressure, the engine won’t last long under the bonnet.

While the oil pump isn’t a routine service item like a filter, caring for it is baked into regular servicing. Using the correct oil grade and changing oil and filter on time are the biggest protectors of pump life. Sludgy or low oil can starve the pump, score its rotors, and drop pressure. Subaru’s manual also highlights correct sealing and priming procedures if the pump/front cover is ever removed.

If replacement is needed (usually due to wear, contamination, or damage), it’s a more involved job because the pump is built into the front cover. A workshop will typically:

• Drain oil and coolant, remove belts and crank pulley, then pull the timing chain/front cover.
• Inspect the strainer and O-ring, pump rotors, and front main seal, replace worn parts.
• Reseal the cover with the specified sealant, prime the new pump with assembly lube, and refill with fresh oil and coolant.

Handy signs it might be time for checks or repair:

• Oil pressure warning light or confirmed low pressure on a mechanical gauge.
• Light rattle from the top end on cold starts, especially if oil grade and level are correct.
• Metallic debris in the oil or a persistent front cover oil leak.

Best practice for local owners across Australia and New Zealand is simple: stick to the service schedule, use quality oil and filters, and get any oil light or leak checked promptly. If the pump or front cover has to come off, ensure the shop follows Subaru’s torque, sealant, and priming steps from the service manual for the FB20. That way, oil pressure comes up straight away and the Impreza stays happy for many more kilometres.

Does a 2015 Subaru Impreza actually have an oil pump?

Yes. Subaru’s 2015MY Impreza Factory Service Manual (FB20, Lubrication) and the Subaru Genuine Parts Catalogue both list a crank-driven trochoid oil pump integrated with the timing chain/front cover. It’s essential to maintaining oil pressure throughout the engine.

When should the oil pump be replaced on a 2015 Impreza?

There’s no routine replacement interval. It’s replaced if there’s confirmed low oil pressure, internal scoring/wear, or contamination damage, or when repairing a major front cover leak. A proper diagnosis includes checking oil level/grade, filter condition, and verifying pressure with a gauge before deciding on a pump swap.

What else should be replaced if the oil pump/front cover comes off?

Commonly replaced items include the front crank seal, timing cover sealant, any disturbed O-rings (such as the oil strainer joint), and fresh engine oil and coolant. Many techs also recommend a new drive belt if it’s due, given the access is already there.