Parts for your 1992 Nissan Primera-Oil cap

1992 Nissan Primera oil cap — purpose and service advice

Based on technical literature, an oil filler cap is absolutely fitted and relevant on the 1992 Nissan Primera (P10). The Nissan Primera P10 Factory Service Manual (MA – Maintenance and EM – Engine Mechanical sections) illustrates the oil filler opening and cap on the cam/rocker cover for GA16DE, SR20DE and CD20 engines. Nissan’s FAST electronic parts catalogue also lists the oil filler cap as a standard replaceable component across these P10 engines, and aftermarket manuals for the Primera (e.g., Haynes 1990–1999 coverage) show the cap in engine bay overviews. So yes, the 1992 Primera uses an oil cap.

On this Primera, the oil cap is the simple but crucial lid that seals the filler neck on the rocker cover. It keeps dirt and moisture out of the engine, helps maintain proper crankcase ventilation via the PCV system by preventing air leaks, and stops oil mist from splashing under the bonnet. The cap relies on a rubber seal or O-ring to make a tight, reusable seal.

As part of routine servicing, it’s worth giving the cap a quick once-over. If the rubber seal has gone hard, cracked or flattened, or the cap’s tabs are worn, expect light oil weep around the filler area, a whiff of oil smell, or a fine mist on the cover. A perished seal can also let dust in, which the engine definitely doesn’t appreciate.

• Check the cap and seal at every oil change (around 10,000–15,000 km, or as per service schedule).
• Wipe the filler neck and the cap’s underside with a clean, lint-free rag before refitting.
• Refit the cap hand-tight only. No tools, no brute force — snug is enough.
• Replace the cap if it’s cracked, cross-threaded, the bayonet tabs are sloppy, or the seal is brittle.
• Choose an OEM or quality aftermarket cap suited to the GA16DE, SR20DE or CD20 as fitted to the vehicle.

Replacing the cap is straightforward: engine off and cool, twist the old cap anti-clockwise, confirm the old rubber seal hasn’t stuck to the neck, then seat the new cap squarely and hand-tighten. After the next drive, pop the bonnet and check the area is dry.

Driving without an oil cap isn’t on. Oil can spray out, contaminate the bay, and dust can get drawn into the engine. If the cap goes missing, use a clean temporary cover only to limp to a parts counter and fit a proper cap as soon as possible.

Popular questions

What oil cap fits a 1992 Nissan Primera?
For most P10s, an OEM-style Nissan bayonet oil filler cap will suit GA16DE, SR20DE and CD20 engines. It’s best to match by engine code and VIN, or bring the old cap to the parts counter. Quality aftermarket caps with the correct seal profile are fine if OEM isn’t available.

Why is there oil around my Primera’s oil cap?
Usually the rubber seal has gone hard or the cap isn’t seating squarely. Replace the cap or seal and clean the area. If oil mist persists, check the PCV valve and hoses