Parts for your 2013 Subaru Impreza-Oil cap

2013 Subaru Impreza Oil Cap

Yes, the 2013 Subaru Impreza uses an engine oil-cap. This is confirmed by Subaru’s technical documentation: the 2013 Impreza Owner’s Manual identifies the “engine oil filler cap” in the engine compartment overview and in the Checking Engine Oil section, the factory service manual (Engine/Lubrication section) references the oil filler cap, and Subaru’s electronic parts catalogue lists a dedicated oil-cap and seal for the FB20 engine used in this model.

On a 2013 Impreza, the oil-cap is a simple but critical piece of kit. It seals the filler neck on the top of the engine’s rocker/valve cover, keeping dust, moisture, and grit out of the lubrication system and preventing oil vapour and mist from escaping under the bonnet. With the cap properly seated, crankcase ventilation flows as intended and the engine maintains the slight vacuum it expects. That means steadier idle, fewer smells, and cleaner operation overall.

As part of regular servicing, the oil-cap deserves a quick once-over. The cap’s O-ring (or gasket) can harden with heat cycles, and the cap itself can get cross-threaded or cracked if it’s forced. A few tell-tales that it’s due for attention include an oily halo around the filler neck, a faint burning-oil whiff after a drive, or a cap that doesn’t snug down squarely. There’s no set replacement interval from Subaru for the cap, it’s a “replace on condition” item—cheap, quick, and well worth doing when the seal looks tired.

Best practice at service time:

• Wipe the cap and filler neck clean before refitting, so no debris drops into the engine.
• Inspect the O-ring for flattening, cracks, or brittleness, replace the seal or the cap if needed.
• Refit by hand only—start threads gently, turn until the O-ring seats, then give a small, firm nip. No tools required.
• After topping up oil, run the engine and check for any weeping around the cap.

If the oil-cap goes missing or is damaged, the vehicle shouldn’t be driven. Oil can spray out, contaminants can get in, and the engine may run poorly due to upset crankcase ventilation. Fit a correct, quality replacement—genuine Subaru or reputable aftermarket—to ensure the seal profile matches the FB20’s filler neck. During routine oil changes, using the oil grade specified in the Owner’s Manual and keeping the cap area spotless will help this Impreza stay tidy and reliable for many kilometres.

Popular questions about 2013 Subaru Impreza oil-cap

Where is the oil-cap on a 2013 Subaru Impreza?
It sits on top of the engine’s valve cover under the bonnet, clearly marked “Engine Oil.” It’s a twist-off cap designed to be removed and refitted by hand when checking or topping up oil.

How often should the oil-cap or O-ring be replaced?
There’s no fixed schedule. It should be inspected at every service. If the O-ring is flattened, cracked, or hard, or if there’s any oil mist around the filler, replace the seal or the complete cap straight away.

Is it safe to drive without an oil-cap?
No. Driving without a cap risks oil spraying in the engine bay, contamination entering the engine, and incorrect crankcase ventilation that can affect how the engine runs. Replace the cap before driving.