Parts for your 2017 Subaru Impreza-Oil cap

2017 Subaru Impreza oil cap — purpose, care, and when to replace

The 2017 Subaru Impreza is fitted with a conventional engine oil filler cap. This is confirmed by Subaru’s own technical literature for the FB-series 2.0‑litre petrol engine used in this model. The 2017 Impreza Owner’s Manual shows the oil filler cap in the engine compartment overview, and factory service information treats the cap and its seal as part of routine lubrication system checks. So, the oil cap is very much relevant to this vehicle.

On this Impreza, the oil cap seals the top of the filler neck on the cam cover, keeping dust and moisture out of the engine and helping maintain correct crankcase ventilation dynamics. It typically carries the oil grade marking (most commonly 0W‑20 for this model), acting as a handy reminder when topping up. The cap’s sealing ring (O‑ring) is designed to handle heat, oil vapour and pressure changes without going hard or cracking—until age and kilometres eventually take their toll.

As part of regular servicing, the oil cap deserves a quick once‑over. A perished O‑ring, a cap that won’t tighten squarely, or signs of oil mist around the filler area are cues it’s time for attention. Driving with a loose or missing cap can leave oil spattered under the bonnet, cause a hot oil smell, and let contaminants into the engine—none of which is ideal on a daily driver.

Practical care tips for a 2017 Subaru Impreza oil cap:

• Check the cap and O‑ring at every oil change. Replace the O‑ring if it’s flat, brittle, or cracked.
• Wipe the cap threads and the filler neck to prevent grit from damaging the seal.
• Re‑fit by hand only, screw on until the seal seats and the cap is snug. No tools or over‑tightening.
• Use a genuine or high‑quality equivalent cap that matches the thread and seal profile for the FB engine.
• If the cap is lost or won’t seal, don’t keep driving—fit a correct replacement before further use.

When replacement is needed, choosing a cap designed for the FB‑series boxer engine keeps things simple. Many Subaru petrol models of the era share a similar cap, but matching by VIN or engine family avoids guesswork. A fresh, correctly sealing cap helps keep the engine bay clean, supports proper crankcase ventilation, and makes routine top‑ups straightforward—exactly what a well‑kept Impreza owner expects.

Where is the oil cap on a 2017 Subaru Impreza?

It sits on top of the engine under the bonnet, on the cam cover, and is clearly marked “Engine Oil.” On many cars it’s a black cap that’s easy to spot near the centre‑top of the engine.

What oil grade is shown on the cap for this model?

Most 2017 Impreza petrol models specify 0W‑20 on the cap and in Subaru owner’s literature for normal Australian and New Zealand conditions. Always confirm with the owner’s manual for local climate and usage.

Can a loose or missing oil cap cause damage?

It can lead to oil spray under the bonnet, a burning oil smell, and potential contamination entering the engine. It should be corrected immediately and the area cleaned before further driving.