Parts for your 2014 Subaru Impreza-Oil cap

2014 Subaru Impreza oil cap — purpose, care and when to replace

Yes, the 2014 Subaru Impreza is fitted with an oil filler cap and it’s absolutely relevant to the way the engine is sealed and serviced. Technical documentation backs this up: the 2014 Impreza Owner’s Manual instructs removing and refitting the oil filler cap during oil checks and changes, the Subaru factory service manual (engine lubrication section) includes the same step, and Subaru’s parts catalogue lists a dedicated “Cap – Oil Filler” for the FB-series 2.0‑litre engine used in this model. Those sources confirm the cap is a standard, serviceable component on this vehicle.

On the FB20 engine, the oil cap sits under the bonnet on the rocker/valve cover and does more than just keep dust out. It seals the top of the crankcase so the positive crankcase ventilation (PCV) system can maintain the right airflow, helps prevent oil mist escaping, and keeps grit and moisture from getting into the engine during everyday driving and servicing. If the cap’s missing, loose, or its rubber seal has gone hard, owners can end up with oil smell, light oil film around the engine, or a rough idle from a small air leak into the crankcase.

There’s no fixed replacement interval for the cap, but it’s smart to check it at every oil service (typically every 10,000–15,000 km, or as per the service schedule). A genuine or quality aftermarket cap with a supple O‑ring is the go. If the cap is cracked, cross‑threaded, or the seal is flattened or brittle, replace it. They’re inexpensive and can save headaches down the track.

Hand‑tight is the rule—no need for a spanner. Before opening, wipe around the area so no grit falls in. During an oil change, cracking the cap before draining can help the oil flow nicely. After refilling (use the right grade and litres per the manual), refit the cap snugly, run the engine, and have a quick look for any weeping. A clean cap and fresh seal help keep the Impreza’s FB20 happy and breathing properly.

• Replace the cap if: it won’t tighten smoothly, the O‑ring is damaged, there’s persistent oil misting, or the cap has heat cracks.
• Keep a spare O‑ring on hand if the vehicle sees lots of heat cycles or dusty conditions.

Popular questions about 2014 Subaru Impreza oil caps

Where is the oil cap on a 2014 Subaru Impreza?
It’s on top of the engine under the bonnet, threaded into the rocker/valve cover. On the FB20 it’s easy to spot—usually a black plastic cap marked for engine oil. Twist anti‑clockwise to remove.

Can driving without an oil cap damage the engine?
Yes. Even a short drive can spray oil around the bay and draw dust or moisture into the engine. It can also upset PCV airflow and cause rough running. If it’s missing, avoid driving and fit a proper cap before starting the engine again.

Does the oil cap have a gasket or O‑ring that needs replacing?
It does. The rubber O‑ring provides the seal. If it’s flattened, hard, cracked or swollen, replace the O‑ring or the complete cap. Inspect it at each service, especially if there’s any oil smell or light misting near the cap.