Parts for your 2013 Subaru Forester-Oil cap

2013 Subaru Forester Oil Cap

An oil cap is absolutely relevant and used on the 2013 Subaru Forester. Technical sources confirm its fitment across the petrol FB25 and turbo EJ255 engines (and the EE20 diesel in some markets). The Subaru Forester Owner’s Manual for this model year labels the “Engine oil filler cap” in the engine-bay overview, Subaru’s service manuals (STIS) include inspection of the cap and O-ring in the lubrication section, and mainstream workshop guides (e.g., Haynes for 2009–2014 models) reference removing/refitting the oil filler cap during oil changes. These sources make it clear the cap is a standard, necessary component.

For this Forester, the oil cap seals the filler neck so engine oil stays clean, contained, and under the right crankcase conditions. It helps keep dust and moisture out, prevents oil mist from escaping, and supports proper crankcase ventilation. On the FB25 petrol, it’s typically a bright, easy-to-spot cap on the rocker cover, the turbo EJ255 and EE20 diesel have similar caps placed for convenient top-ups.

As part of regular servicing, the oil cap deserves a quick once-over. The cap’s O-ring can harden, flatten, or crack over time, causing light weeping or a whiff of hot oil after a drive. If the cap’s threads or bayonet tangs are chewed, or the seal’s gone stiff, it’s time for a replacement. A genuine or high-quality aftermarket cap with the correct O-ring material (commonly nitrile, sometimes Viton) will do the job nicely.

Hand-tight is the go—snug it down until the O-ring seats, then a gentle nip. Over-tightening can deform the seal or damage the cap. During an oil change, wipe the filler neck, make sure the old O-ring hasn’t stuck to the engine, and dab a smear of clean oil on the new seal for smooth fitting. On turbo XT models, a good seal is extra important due to higher crankcase pressures under boost.

What to watch for:

• Oil film or dampness around the cap area, burning-oil smell, or a light mist on nearby covers
• Cap that won’t stay snug, cracked plastic, or a perished O-ring
• Rough idle or ventilation oddities if the cap is missing or loose

Given the low cost and high importance, inspecting the oil cap at every service and replacing it as needed is a smart, simple bit of preventative care for any 2013 Forester.

Where is the oil cap on a 2013 Subaru Forester?

On most 2013 Forester petrol models with the FB25 engine, the oil cap sits on the rocker cover and is usually a bright, easy-to-see piece near the front-left when facing the car. On the turbo EJ255 (XT), it’s on top of the engine as well, slightly offset. The EE20 diesel also has a clearly marked filler cap on the cam cover area. It’s designed to be obvious for quick top-ups and checks.

What happens if the oil cap is loose or missing?

Expect an oil smell, light splatter or mist under the bonnet, and dust finding its way into the filler area. It can upset crankcase ventilation, and in some cases the engine may idle a bit off. It’s best not to drive far without a cap—fit a correct replacement straight away to avoid contamination and mess.

Does the oil cap need a set torque?

No special torque spec is required. It’s designed for hand-tight installation—seat the O-ring and give it a firm, comfortable nip. If it creaks, binds, or needs force, stop and check the threads and the O-ring condition. Over-tightening can damage the cap or squash the seal.