Parts for your 2012 Nissan Navara-Oil cap

2012 Nissan Navara Oil Cap: What it does and how to look after it

Per Nissan’s Navara D40 Owner’s Manual (2012) and the Nissan factory service information for the YD25DDTi and V9X engines, the 2012 Navara is fitted with a threaded oil filler cap on the cam/rocker cover. So yes, an oil cap is absolutely relevant and used on this ute.

The oil cap on a 2012 Nissan Navara seals the engine’s oil filler neck, keeping dust, moisture, and road grime out while stopping oil vapour and splashes from escaping under the bonnet. It’s a small, simple part, but it plays a big role in crankcase sealing and helps the PCV system do its job. A good cap and seal prevent messy oil film on the engine cover and reduce the chance of contamination that can shorten oil and engine life.

As part of routine servicing, the oil cap deserves a quick once-over. At each oil change, wipe the cap clean, check the threads for damage, and inspect the rubber seal/O-ring. If the seal is flattened, cracked, or hard, replace the cap or the seal to maintain a proper seal. A lightly oiled seal (a smear of fresh engine oil) helps it seat nicely and come off easily next time.

Hand-tightening is the go—snug until it seats, no need to reef on it with tools. Over-tightening can deform the seal or crack the cap. If there’s oil weeping around the filler neck, a noticeable whiff of oil vapour after a drive, or oil mist on the engine cover, the cap or seal may be past it.

When replacing, choose a cap that matches your engine (YD25 2.5L diesel, V9X 3.0L V6 diesel, or VQ40 petrol in some markets). A genuine-cap or a quality equivalent with a heat-resistant elastomer seal (e.g., NBR or Viton) is best. If the cap goes missing, don’t run the engine—dirt can enter and oil can sling out quickly. Covering the hole with a rag is a no-no, fibres can fall into the engine.

• Check the cap and seal every service (10,000–15,000 km, or as per your schedule).
• Replace at the first sign of cracking, hardening, or persistent weeping.
• Keep the area around the filler neck clean before removing the cap.

Popular questions

Where is the oil cap on a 2012 Nissan Navara?
It’s on top of the engine’s cam/rocker cover, visible once the bonnet’s up. Look for the “engine oil” wording or the little oil can symbol. Some models have an engine cover—just lift or remove it to access the cap.

Can you drive without an oil cap or with a broken seal?
Not recommended. Without a proper cap, oil can spray out and contaminants can get in. A split or rock-hard seal can also cause leaks and odours. Sort it before driving to avoid a mess and potential engine issues.

Which oil cap fits my 2012 Navara?
It depends on your engine code (commonly YD25 for the 2.5 diesel, V9X for the 3.0 V6 diesel, or VQ40 petrol in some markets). Match by VIN or rego with a parts supplier, or follow the spec in the owner’s manual/service info.