Parts for your 2020 Nissan Pathfinder-Oil cap

2020 Nissan Pathfinder oil-cap: what it does and how to look after it

Based on the 2020 Nissan Pathfinder Owner’s Manual and Nissan’s Engine Mechanical (EM) service information for the VQ35DD 3.5‑litre V6, this model uses a conventional screw‑on engine oil filler cap. It’s a required part, fitted from factory, and sits on top of the engine under the bonnet. Without it, the crankcase can’t seal properly and the PCV system won’t work as designed.

The oil-cap’s core job is simple but important: it seals the oil filler neck so engine oil stays clean and inside the engine, and crankcase vapours are managed through the PCV system rather than venting into the engine bay. A sound cap helps maintain the slight vacuum in the crankcase, supporting stable idle quality and emissions control. Leave it loose or off and you risk oil splatter, a burning‑oil odour, dust or moisture ingress, and even a check engine light from unmetered air upsetting fuel trims.

During routine servicing, the oil-cap deserves a quick once‑over. After refilling, it should be refitted hand‑tight until it positively seats. Over‑tightening with tools isn’t needed and can damage the threads or the sealing gasket. A light wipe of the cap and filler neck keeps grit away from the opening. If the rubber seal looks flattened, cracked, or perished, swap the cap or seal to keep the engine breathing properly.

Because the cap is handled at every oil change, it can wear before the rest of the engine bay plastics. A genuine Nissan cap will match the thread and sealing surface precisely, and the top usually shows the recommended oil spec for quick reference. If the spec on the cap and the owner’s manual don’t match, follow the manual for your climate and market.

• Replace the oil-cap if you notice: fuel or oil smells after driving, oil mist around the filler area, a cap that won’t seat snugly, a hardened or missing gasket, or visible cracks.
• Service tip: after an oil change, start the engine and check around the cap for any weeping. Recheck tightness once the engine’s run and cooled.
• If the cap goes missing, don’t drive far—covering the hole is a short stopgap only. Fit the correct cap as soon as possible to avoid contamination.

Look after this small part and it quietly keeps the Pathfinder tidy, efficient, and happy on every school run and weekend escape.

FAQs

Where is the oil-cap on a 2020 Nissan Pathfinder?
The cap sits on the top of the V6 engine under the bonnet, typically at the front or slightly to one side of the plastic engine cover. It’s the one you remove to add engine oil and often has the oil grade embossed on it.

What are the signs the oil-cap needs replacing?
Common clues are a fuelly or burning‑oil odour, light oil mist around the filler neck, a cap that won’t tighten confidently, or a cracked/hardened rubber seal. Rough idle or a check engine light after a service can also point to a cap that’s loose or leaking.

Can driving without the oil-cap damage the engine?
Yes. Without the cap, dust and moisture can enter, oil can splash out, and the PCV system can’t control crankcase vapours. Short, gentle movement to a safe spot is one thing, but it shouldn’t be driven normally until the correct cap is refitted.