Parts for your 2012 Subaru Impreza-Oil pump

2012 Subaru Impreza oil pump – what it does and how to look after it

Based on the Subaru Factory Service Manual for the FB-series engine (Engine Lubrication section), the Subaru FAST parts catalogue listing the Pump Assy – Oil for the 2012 Impreza, and common repair data used by workshop manuals, the 2012 Subaru Impreza absolutely uses an oil pump. It’s a crank-driven, internal trochoid-style pump housed in the timing cover on the FB20 engine, and it’s vital to the engine’s pressurised lubrication system.

This oil pump’s whole job is to pull oil from the sump, pressurise it, and push it through galleries to bearings, camshafts, the timing chain and other moving bits. Without that steady pressure, metal surfaces would cop it, temperatures would spike, and the engine wouldn’t last long. The pump also carries an inbuilt pressure relief valve to keep things in the sweet spot as revs rise.

For servicing, the smart play is prevention. Stick to correct-grade engine oil and change intervals as per the handbook (commonly a high-quality full-synthetic 0W-20 or 5W-30 meeting the proper spec, suited to local climate). Fresh, clean oil is the pump’s best mate, sludge and grit are what wear the pump’s rotors and score the housing. Always use a quality oil filter with a proper anti-drainback valve, and keep an eye on any oil leaks at the timing cover—sealant failure or a tired O-ring can let air in and pressure out.

Signs the oil pump system needs attention include a flickering oil pressure light at idle, rattly top-end noise on cold start, or a delayed pressure build after an oil change. If any of that pops up, don’t push on—get a pressure test done with a mechanical gauge. On the FB20, pump replacement is more involved than on older bolt-on units because it lives in the timing cover and is driven off the crank. If replacement is required, a competent workshop will use the correct Subaru-type sealant on the cover, renew O-rings and the pickup seal, check bearing clearances, and verify pressure hot and cold after reassembly.

There’s no set replacement interval for the pump itself, it’s generally “replace on condition.” Look after the oil, fix leaks early, and the pump usually goes the distance.

• Use the correct oil grade and spec for Aussie/NZ conditions.
• Change oil and filter on time to reduce wear and sludge.
• Investigate any oil light, ticking, or pressure warnings immediately.

Popular questions about 2012 Subaru Impreza oil pumps

Does the 2012 Subaru Impreza actually have an oil pump?

Yes. Factory literature for the FB20 engine specifies a crank-driven trochoid oil pump integrated with the timing cover. It’s essential for maintaining oil pressure to bearings, cams and the timing chain.

What are common symptoms of a failing oil pump on a 2012 Impreza?

Look for a flickering oil pressure warning at idle, noisy valve gear on cold start, or low measured oil pressure. Any of these warrant immediate inspection and a mechanical oil pressure test.

Should the oil pump be replaced during regular servicing?

No. It’s not a routine service item. Replacement is typically only needed if there’s pressure loss, internal wear, contamination damage, or sealing issues. Regular oil and filter changes are the best preventative maintenance.