Parts for your 2017 Mitsubishi Asx-Oil cap

2017 Mitsubishi ASX oil cap — purpose, care, and when to replace

Yes, the 2017 Mitsubishi ASX uses an oil filler cap. This is confirmed in Mitsubishi Motors technical literature, including the 2017 ASX Owner’s Manual (maintenance section covering engine oil top-ups) and the workshop/service manuals for its common engines (such as the 2.0-litre MIVEC petrol and 2.2-litre diesel). Those sources show a sealed crankcase system with a removable oil filler cap on the cam/rocker cover, clearly marked for adding engine oil. So, the oil cap is very much relevant on this model.

The oil cap on a 2017 ASX does two vital jobs. First, it provides the access point for topping up oil under the bonnet. Second, it seals the engine’s top end, helping the PCV system maintain the right crankcase pressure while keeping dust, moisture, and grit out. A healthy cap and gasket stop oil vapour and mist from escaping, which helps avoid oily residue on the cover, hot-oil smells, and messy engine bays. If the cap or its seal is cracked, loose, or missing, owners can see leaks, hear a slight hiss, or even cop a rough idle because of unmetered air sneaking into the crankcase ventilation path.

There’s no fixed replacement interval for the cap, but it’s smart to check it at every service or whenever oil is topped up. Routine care is simple:

• Wipe around the cap before removal so dirt can’t drop in.
• Inspect the rubber seal/O-ring for hardening, splits, or flattening.
• Make sure it seats squarely and is hand-tight — don’t force or cross-thread it.
• Replace the cap if there’s visible seepage, if it won’t latch, or after heat damage.

If the original is damaged or lost, a genuine or quality aftermarket cap designed for the ASX’s engine family is the go. Part numbers vary by engine variant and market, so matching by VIN or engine code avoids guesswork. Driving without a cap isn’t recommended, oil can spray under load, and contaminants can find their way in. As part of regular servicing, a quick cap-and-seal check is cheap insurance for engine longevity, keeps the bay tidy, and helps the ASX run sweet as.

Popular questions about the 2017 Mitsubishi ASX oil cap

Where is the oil cap on a 2017 ASX?
It’s on top of the engine’s cam/rocker cover under the bonnet, marked “Engine Oil.” Depending on engine variant, it’s typically a black cap that twists off by hand. If unsure, follow the engine oil symbol on the cover.

What are the signs the oil cap needs replacing?
Look for oil film or wetness around the cap, a perished or flattened rubber seal, hot-oil smells after a drive, or a cap that won’t seat firmly. In some cases, a poor seal can contribute to a slightly rough idle.

Can the ASX be driven without the oil cap?
Not safely. Without the cap, oil can mist out and contaminants can get in. If a cap goes missing, fit a proper replacement before regular driving rather than improvising a temporary cover.