Parts for your 2020 Nissan X-trail-Oil cap

2020 Nissan X‑Trail oil cap — purpose, care and when to replace

Technical sources confirm the 2020 Nissan X‑Trail (T32) does use an engine oil filler cap. It’s identified in the Nissan X‑TRAIL (T32) Owner’s Manual under the bonnet check points as the “engine oil filler cap”, and referenced in the T32 Service Manual within Maintenance (MA) and Lubrication (LU) sections as part of the sealed crankcase system. So yes, an oil cap is fitted and it matters.

On a 2020 X‑Trail, the oil cap seals the top of the rocker/valve cover and provides the access point for topping up engine oil. Its job is two‑fold: keep dust and grit out, and keep oil and crankcase vapours in. A good cap (and its rubber seal) helps the PCV system maintain the slight vacuum the engine expects, which supports smooth idle and reduces oil misting. If the cap’s loose, missing, or the seal’s perished, owners can see oil weeping around the cover, smell hot oil, or cop a messy engine bay after a drive.

As part of routine servicing on a 2020 X‑Trail, the cap deserves a quick once‑over:

• Under the bonnet, wipe around the cap before removal to stop debris dropping in.
• Inspect the cap’s rubber seal/O‑ring for hardening, cracks, flattening or swelling.
• Check the threads and the locking tabs, the cap should start easily by hand and seat squarely. No cross‑threading.
• Refit hand‑tight only until it seats firmly, don’t overdo it. If it’s a click‑type, twist until it clicks.

Replace the cap if the seal’s tired, the cap no longer clamps firmly, you notice recurring oil smell after drives, or there’s visible misting around the filler neck. Genuine caps are inexpensive and designed to match the X‑Trail’s QR/MR‑series petrol or diesel rocker cover tolerances. A fresh cap also prevents nuisance warning lights caused by crankcase air leaks in some scenarios.

Best practice during oil changes: fit the cap loosely while draining to remind the tech it’s open, then refit snugly after filling. After a few kilometres, a quick look for any dampness around the cap area is a smart move.

Technical sources used: Nissan X‑TRAIL (T32) Owner’s Manual (2019–2020), “Maintenance and do‑it‑yourself”/engine compartment check locations, Nissan X‑TRAIL (T32) Service Manual, Maintenance (MA) and Lubrication (LU) sections describing engine oil filling and sealing components.

Popular questions

Where is the oil cap on a 2020 Nissan X‑Trail?
It’s on top of the engine under the bonnet, usually centred or slightly to one side on the rocker/valve cover. It’s a round, twist‑off cap marked for engine oil. On most 2.5‑litre petrol models it’s easily visible from the front of the vehicle.

Can the X‑Trail be driven without the oil cap?
No. Driving without the cap risks oil spraying out, rapid oil loss, contamination, and incorrect crankcase ventilation. If the cap’s missing, shut the engine down and fit a correct replacement before driving.

How often should the oil cap or seal be replaced?
There’s no fixed interval, but it’s smart to inspect at every service. Replace the cap or seal when there are signs of hardening, cracking, leaks, or if the cap no longer tightens positively. Many owners find the original lasts years, but conditions and heat cycles vary.