Parts for your 2018 Haval H6-Oil cap

2018 Haval H6 Oil Cap — Purpose, care, and when to replace

Yes, the 2018 Haval H6 uses an engine oil filler cap. Technical references including the 2018 Haval H6 Owner’s Manual (engine compartment layout), the Haval electronic parts catalogue (H6 with GW4C20/GW4G15B engines), and GW4C20 workshop material all identify a screw-on oil filler cap and seal on the rocker/cam cover. It’s a small part that does a big job: sealing the oil system, keeping contaminants out, and helping the crankcase ventilation system do its thing.

On a 2018 Haval H6, the oil cap is typically marked with an oil can symbol and often the recommended viscosity. Under the bonnet, it’s on the top of the engine cover/rocker cover for quick access during servicing. A healthy cap prevents oil mist from escaping and grit or moisture from getting in, which protects the turbo, timing components, and lifters from premature wear.

As part of routine servicing, it’s worth giving the oil cap a quick once-over. Check that the cap threads aren’t chewed out and that the rubber O-ring or gasket is soft, intact, and sealing nicely. Wipe the sealing seat on the cam cover so nothing compromises the seal. When refitting, tighten by hand until seated, then a gentle nip — no tools needed. Over-tightening can crack the cap or distort the seal.

If the cap is damaged, missing, or left loose, oil can spray around the engine bay, there’ll be a whiff of burnt oil, and the engine may idle roughly due to unmetered air entering the crankcase. If there’s any sign of cracking, a hardened O-ring, or persistent weeping, replace the cap with a genuine or quality OE-equivalent part to ensure proper fit and ventilation. Many workshops treat the O-ring as a consumable: replace it if it’s flattened, swollen, or more than a few years old.

Good practice for H6 owners in Aus and NZ is to inspect the oil cap at every oil change (typically 10,000–15,000 km or 12 months, per local conditions). It’s a low-cost bit of peace of mind that helps keep the engine clean, quiet, and happy on long Kiwi and Aussie drives.

• Replace the oil cap/O-ring if: it’s cracked, the seal is hard or split, there’s oil mist around the filler, or the cap no longer tightens positively.
• Always clean the sealing area and use the correct spec cap for the H6 engine variant.

Popular questions about the 2018 Haval H6 oil cap

Where is the oil cap on a 2018 Haval H6?
It sits on top of the engine’s rocker cover under the bonnet, marked with an oil can symbol. On most H6 variants, it’s front-and-centre for easy access during oil changes.

Can the H6 be driven without the oil cap?
Best not. Driving without the cap can fling oil around the bay, contaminate the engine with dust and moisture, and upset crankcase ventilation. If the cap is missing or broken, replace it before driving.

Do universal oil caps fit the 2018 H6?
Some “universal” caps may not seal or vent correctly. Use a genuine Haval cap or a high-quality OE-equivalent matched to the H6 engine to ensure proper thread engagement and gasket fit.