Parts for your 2020 Subaru Impreza-Oil cap

2020 Subaru Impreza Oil Cap: What It Does and How to Look After It

According to the 2020 Subaru Impreza Owner’s Manual (Maintenance and service – Engine oil) and the Subaru FB20 engine service literature (Lubrication section), the Impreza is fitted with a standard threaded oil filler cap on the FB20 2.0‑litre boxer engine. It’s the point under the bonnet where engine oil is added and it’s essential to normal operation, not an optional or redundant part.

The oil cap’s job is straightforward but vital. It seals the top of the engine’s oil filler neck, keeping dust and moisture out, preventing oil vapour and splash from escaping, and helping maintain correct crankcase ventilation. Many caps on this model are marked “0W‑20”, reminding owners of the specified full‑synthetic grade recommended by Subaru in this generation.

As part of regular servicing of a 2020 Subaru Impreza, the oil cap deserves a quick once‑over. A tired cap or perished seal can mist oil around the rocker cover area, leave a faint burning‑oil smell, or, if left loose, allow unmetered air into the crankcase ventilation path, potentially upsetting idle quality and fuel trims.

• Inspect at every service (about every 12 months/12,500 km in AU/NZ): check the cap body for cracks and the rubber O‑ring for flattening, hardening, or splits.
• Wipe the filler neck and cap threads clean before refitting