Parts for your 2018 Haval H6-Sump plug washers

2018 Haval H6 sump plug washer – what it does and when to replace it

Based on Haval/GWM service literature for the H6 petrol engines of this era and common aftermarket fitment catalogues used in Australia and New Zealand (e.g., Tridon and Ryco application data), the 2018 Haval H6 uses a conventional threaded sump (engine oil) drain plug with a replaceable sealing washer. Those technical sources specify a gasket/washer at the drain plug and recommend renewal when the plug is removed during an oil change.

On the 2018 Haval H6, the sump plug washer’s job is simple but crucial: it seals the plug to the alloy sump so engine oil doesn’t weep under heat cycles and vibration. It’s a crush-style gasket (usually aluminium or copper, sometimes a bonded type) that deforms slightly on tightening to create a reliable seal without over-stressing the sump threads.

For servicing, best practice is to fit a new washer at each oil change. The part is inexpensive, and replacing it helps avoid drips on the driveway, messy undertrays, and the temptation to overtighten the plug to “chase” a seal. After refitting with a fresh washer, the plug should be tightened to the workshop torque spec for the H6 engine, correct torque protects the sump threads and gives the washer the right crush. The plug and sump face should be clean and flat, with no old gasket material stuck on. Thread sealant or tape isn’t required and shouldn’t be used.

Owners will often see washers offered in aluminium, copper, and bonded (metal with rubber). Any quality washer that matches the plug size and seat style will do the job, many technicians prefer aluminium on alloy sumps for predictable crush, while copper is a durable alternative. Some replacement plugs come with a captive or integrated washer—these are still considered a service item and should be renewed when removed, just like a separate washer.

Signs a washer has had its day include a damp ring around the plug, a light oil mist on the undertray, or a drop or two on the garage floor after a run. Given the low cost, replacing rather than reusing is the smart play for the H6.

• Always match the washer to the plug size and seat type.
• Renew at every oil service or whenever the plug is removed.
• Torque the plug to the Haval spec—don’t rely on feel.

Does a 2018 Haval H6 need a new sump plug washer at every oil change?
Yes, that’s the accepted practice in local workshops and is supported by OE-style service guidance. A fresh washer ensures a clean seal without over-tightening, protecting the sump threads and keeping the underbody tidy.

Which type of washer suits the 2018 H6?
Use a quality crush-type washer that matches the plug’s diameter and seat. Aluminium and copper are both common choices on the H6, bonded washers may also be suitable. If unsure, match by VIN or take the old plug/washer to a parts counter for sizing.

What happens if the washer isn’t replaced?
Reusing a flattened washer can lead to weeping, and people often compensate by overtightening the plug. That risks stripping the sump threads. Given the low cost of a washer, replacement is the safer, tidier option.