Parts for your 2020 Haval H6-Oil cap

2020 Haval H6 oil-cap — purpose, care and when to replace

Technical documentation confirms the 2020 Haval H6 is fitted with an engine oil filler cap, making the oil-cap fully relevant to this model. Sources include the Haval H6 Owner’s Manual (MY2020) under Maintenance/Engine Oil, the GWM/Haval workshop manual for GW4B15 and GW4C20 petrol engines (Lubrication System procedures note removing/refitting the oil filler cap during oil service), and the Haval Electronic Parts Catalogue listing the oil filler cap as part of the cylinder head cover assembly.

On the 2020 Haval H6, the oil-cap does more than just cover the filler hole. It seals the top of the engine to keep dust and moisture out, helps maintain correct crankcase ventilation pressures, and provides a clean entry point for topping up oil. Many caps are marked with the recommended oil grade reminder, steering owners back to the spec in the manual. If the cap’s missing, loose, or its seal is perished, oil mist can escape, the engine bay can get messy, and unfiltered air may find its way into the engine—none of which is ideal for long-term reliability.

As part of regular servicing—typically every 10,000 km or 12 months in local conditions—the oil-cap should be inspected. The rubber O-ring or gasket needs to be soft, intact and free of cracks. A quick wipe of the cap and the filler neck helps prevent grit from dropping into the engine when topping up. When refitting, hand-tighten until the cap seats firmly, don’t overdo it, as that can distort the seal or damage the threads.

Replacement is straightforward if the cap is cracked, the seal has flattened, or it no longer locks positively. A genuine or high-quality equivalent cap ensures the correct fit and ventilation characteristics for the H6’s turbocharged four-cylinder engines. After replacing, check for oil odour, misting or weeping around the cap area after a few drives—signs everything is sealing as it should. If there’s any persistent whistling, vacuum noise, or rough idle after an oil-cap change, have the PCV and cap fitment checked.

• Inspect the cap and O-ring at every service.
• Keep the filler neck clean before topping up.
• Use the correct-spec oil listed in the owner’s manual.

FAQs

Where is the oil-cap on a 2020 Haval H6?
It sits on the top of the engine under the bonnet, threaded into the cam/rocker cover. Look for a round, twist-off cap—often with an oil can symbol. It’s easily accessible for routine top-ups.

What are signs the oil-cap needs replacing?
Look for a hardened or cracked O-ring, difficulty locking the cap, oil mist around the cap area, or a noticeable oil smell after driving. Any of these can indicate a poor seal and it’s worth fitting a fresh cap.

Is it safe to drive if the oil-cap is missing?
It’s not recommended. Without the cap, contaminants can enter the engine and oil can splash out, causing smells, smoke, and potential damage. Fit a correct cap before driving, or keep the trip to a minimum if you must move the vehicle to a workshop.