Parts for your 2020 Nissan Serena-Oil cap

2020 Nissan Serena oil cap — purpose, care and replacement

Based on Nissan’s technical literature, the 2020 Nissan Serena is fitted with an engine oil filler cap and it’s absolutely relevant to routine servicing. The C27-series Owner’s Manual (2019–2020) labels the “Engine oil filler cap” in the engine-bay layout, and both the MR20DD petrol and e-POWER range-extender (HR12) service procedures note removing/refitting the oil filler cap during oil changes. Nissan electronic parts catalogues for the C27 also list the cap and its seal as replaceable components.

The oil cap on a 2020 Nissan Serena seals the top of the rocker/valve cover where engine oil is added. Simple bit of kit, but it does a few big jobs: it prevents oil splash and vapour escaping, helps maintain correct crankcase ventilation, and keeps dust, moisture and grit out of the engine. On many Serenas, the cap is marked with the recommended oil grade (often 0W-20) — a handy reminder, but always follow the vehicle’s handbook for the exact spec.

There’s no fixed replacement interval for an oil cap, but it’s smart maintenance to check it at every service. Under the bonnet, make sure the cap turns smoothly and seats snugly by hand. A quick wipe around the filler neck before removal keeps debris from dropping inside. If the rubber O-ring is hard, flattened, or cracked, or the cap body is damaged, replace it straight away.

• Common signs it needs attention:
  • Oil smell or light misting around the cap area
  • Visible weeping on the rocker cover near the filler neck
  • Cap hard to tighten or doesn’t “bite” properly
  • Missing, brittle or swollen O-ring
  • Rough idle or warning lights after a service if the cap’s left loose

Swapping a cap is a two-minute job: wipe the area, remove the old cap, inspect and replace the seal if it’s separate, then fit the new cap hand-tight. Don’t overdo it — firm by hand is the go. Using a genuine Nissan cap or a quality equivalent that matches the Serena’s thread and seal profile keeps ventilation and sealing spot on.

Whether it’s the MR20DD petrol or the e-POWER’s generator engine, a healthy oil cap helps keep oil where it belongs and the engine breathing properly — small part, big peace of mind for Kiwi and Aussie Serena owners.

Popular questions

Where is the oil cap on a 2020 Nissan Serena?
The oil cap sits on the top of the engine’s rocker/valve cover under the bonnet, clearly marked for engine oil. On right-hand-drive Serenas, it’s typically near the centre or front of the cover, easy to spot and reach.

What oil grade is shown on the cap, and do I have to use it?
Many caps show 0W-20, which aligns with Nissan’s common recommendation for fuel efficiency. Treat the cap as a prompt, but always follow the Owner’s Manual and local climate guidance. If towing or operating in hotter regions, service info may allow different grades.

Is it safe to drive without the oil cap?
No. Driving without the cap can spray oil inside the engine bay, drop oil level quickly and upset crankcase ventilation. If the cap’s missing or damaged, stop, switch off and fit a correct replacement before continuing.