Parts for your 2014 Mitsubishi Asx-Oil cap

2014 Mitsubishi ASX Oil Cap — What It Does and How to Look After It

Yes, the 2014 Mitsubishi ASX uses an engine oil filler cap. Technical sources including the 2014 ASX Owner’s Manual (engine compartment overview and maintenance sections) and Mitsubishi Motors service manuals for the 4B11/4B12 petrol and 4N1 diesel engines identify and illustrate the oil filler cap on the top of the rocker/valve cover. It’s a standard, essential part used for both petrol and diesel variants.

The oil cap’s job is straightforward but critical: it seals the engine’s oil filler neck to keep dust, moisture, and grime out, and to stop oil from splashing or misting out under normal operation. A properly sealing cap helps maintain correct crankcase ventilation behaviour and prevents unmetered air leaks that could trigger a check engine light or rough idle. Pop the bonnet and you’ll usually find it marked with an oil can symbol or “Engine Oil”.

As part of routine servicing, it’s worth giving the oil cap a quick once-over. The cap’s rubber seal (O-ring) should be soft, pliable, and free from cracks. If the seal is hard, flattened, or split, replace the seal or the entire cap. A worn or loose cap can lead to oily residue around the filler neck, a burning oil smell, and gradual oil loss between services.

When refitting after a top-up or oil change, wipe the filler neck and cap threads with a lint-free rag. A tiny smear of fresh engine oil on the O-ring helps it seat smoothly. Fit the cap squarely and tighten by hand until it’s snug—no need to lean on it with a spanner. Over-tightening can distort the seal or damage the threads. If the cap won’t click or hold tension, it’s time to replace it.

Genuine or high-quality aftermarket caps designed for the ASX are the safest choice to ensure the correct thread pitch and seal profile. For drivers who’ve lost a cap, avoid running the engine with the cap off—if absolutely necessary, only drive a short distance to a workshop after covering the opening to minimise contamination. As a simple, inexpensive item that protects a very expensive engine, the oil cap deserves a quick check at every service interval.

• Inspect the cap and seal at each oil change or 10,000–15,000 km service.
• Replace if the seal is perished, the cap won’t hold tension, or there’s persistent oil misting.
• Keep the area clean to make leaks easy to spot.

FAQ: Where is the oil cap on a 2014 Mitsubishi ASX?

Under the bonnet, on top of the engine’s rocker/valve cover. It’s typically marked with an oil can symbol or “Engine Oil”. Turn anti-clockwise to remove, clockwise to refit.

FAQ: What happens if the oil cap is loose or missing?

You may notice oil splatter, a hot oil smell, or a mess around the filler area. The engine can run rough and a check engine light can appear due to unmetered air. Don’t drive far without a proper cap—fit the correct replacement as soon as possible.

FAQ: Does the oil cap have a gasket that needs replacing?

Yes. Most ASX caps use a rubber O-ring. If it’s hard, cracked, or flattened, replace the seal or the cap. It’s a cheap fix that prevents bigger issues.