Parts for your 2018 Subaru Impreza-Oil filter

2018 Subaru Impreza oil filter — purpose and service advice

Based on technical sources including the 2018 Subaru Impreza Owner’s Manual (Maintenance and Service section), the Subaru FB20 engine service manual (Lubrication System), and the Subaru Genuine Parts Catalogue for MY18 Impreza, the vehicle is fitted with a spin‑on engine oil filter and it is a required service item. Typical Subaru part numbers listed for this model include 15208AA15A (superseding earlier 15208AA12A).

For the 2018 Subaru Impreza, the oil filter’s job is straightforward but critical: it traps fine contaminants like carbon, varnish and microscopic metal particles so clean oil can circulate through the FB20’s tight clearances. By keeping grit out of bearings, cam journals and the timing components, the filter helps the engine run smoothly, stay quiet on cold starts and last the distance. A quality filter also manages flow with a bypass valve and prevents dry starts with an anti‑drainback valve—useful for everyday Kiwi and Aussie conditions where plenty of short hops can be the norm.

Servicing is simple: the oil filter should be replaced at each scheduled oil change. In Australia and New Zealand, the scheduled service program typically calls for engine oil and filter replacement at regular intervals (often around every 12 months or 12,500 kilometres under normal driving). More frequent changes make sense if the Impreza sees lots of short trips, stop‑start city work, dusty roads, or towing. Sticking with a genuine Subaru filter or a high‑quality equivalent that matches the FB20’s specifications helps maintain correct bypass pressure and anti‑drainback performance.

Good practice during replacement includes lubricating the new gasket, spinning the filter on until the gasket seats, then tightening as directed on the filter body (commonly a further two‑thirds turn by hand). Always check the old gasket isn’t stuck to the block, wipe the sealing surface clean, and run the engine to confirm a dry seal and proper oil pressure. Pair the new filter with the correct oil grade—0W‑20 meeting the appropriate API/ILSAC spec is typically specified for the 2018 Impreza—and replace the sump plug washer to prevent weeps.

• Watch for tell‑tales like a flicker of the oil light at idle, noisy cold starts or dirty, gritty oil on the dipstick—signals it’s time to service.
• Disposing of the old filter responsibly is part of the job, most parts stores and councils offer oil recycling options.

What oil filter fits a 2018 Subaru Impreza?

Subaru’s commonly listed genuine filter for the 2018 Impreza (FB20) is 15208AA15A, which supersedes 15208AA12A. Quality aftermarket equivalents exist, but using a filter validated for the FB engine’s bypass and anti‑drainback requirements is recommended to protect cold‑start lubrication and oil pressure stability.

How often should the oil filter be changed in Australia or New Zealand?

Under normal use, the oil filter is replaced at each scheduled service alongside engine oil—typically about every 12 months or 12,500 kilometres. Vehicles that mostly do short trips, see dusty conditions or heavy traffic idling benefit from shorter intervals.

Can owners change the oil filter themselves?

Yes, it’s a straightforward DIY for competent home mechanics: warm the engine, drain the oil, remove the old filter, prepare and install the new filter, then refill with the specified 0W‑20 oil and check for leaks. Always follow the Owner’s Manual guidance, use a new sump plug washer and dispose of oil and filters responsibly.