Parts for your 2012 Holden Commodore-Sump plug washers

2012 Holden Commodore sump-plug washers — what they do and when to replace them

For the 2012 Holden Commodore, a sealing washer (also called a sump-plug washer or gasket) is used at the engine oil drain plug. This is supported by Holden/GM Service Information for VE Series II models, which specifies an M14 x 1.5 drain plug that seals via a replaceable crush washer or an integral bonded gasket, depending on engine variant. ACDelco parts catalogues list compatible plugs with captive seals used across VE/VF Commodore powertrains. So yes—there is a washer or seal in play, and it’s an important one.

The washer’s whole job is to create a tight seal between the sump and the drain plug so hot oil doesn’t seep out under pressure or vibration. On many 2012 Commodores, that seal is either a soft-metal crush washer (commonly copper or aluminium) that compresses once, or a plug with an integrated rubber/nylon gasket designed to be replaced when worn. Either way, the car relies on that ring to keep the sump clean and dry.

Best practice during servicing is to replace the washer at every oil change—typically every 15,000 km or 9 months in local conditions—because the material work-hardens or the gasket flattens over time. If the plug on the vehicle has a bonded seal, it should be inspected for nicks, flattening or hardening, replace the plug or the seal if any damage is found. Reusing a tired washer is a common cause of slow drips after a service.

When fitting a new washer:

• Clean the mating face on the sump and the plug head.
• Match size correctly (most are M14 for 2012 Commodore, but check engine code/VIN).
• Install the washer the right way around if it’s stepped or tapered.
• Tighten to the manufacturer’s spec—typically around 25–30 Nm for an M14 GM plug, but confirm for the specific engine (V6 SIDI/LFX or V8 L77).

Signs a washer needs attention include fresh oil weeping around the plug, a faint oil mist on the bottom of the sump after a drive, or a drip spot appearing on the driveway. Tech sources from Holden/GM SI and ACDelco note that sealing integrity depends on correct torque and a fresh, undamaged washer or gasket—so it’s a tiny, inexpensive part that earns its keep every kilometre.

Popular questions

Do all 2012 Commodores use the same sump plug washer?
Most 2012 models use an M14 x 1.5 drain plug. Some engines run a separate copper/aluminium crush washer, while others use a plug with a captive rubber/nylon gasket. It’s best to confirm by engine code (e.g., LFX V6, L77 V8) or with the VIN before buying.

How often should the sump plug washer be replaced?
Replace the washer at every oil change. If the plug has a bonded gasket, inspect it each service and replace the plug or seal when it shows flattening, nicks, or hardening. Fresh seal equals fewer leaks.

What washer material is best for a 2012 Commodore?
Copper and aluminium crush washers both work well, aluminium often matches alloy sumps, while copper seals reliably and compresses consistently. Captive rubber/nylon gaskets on OEM-style plugs are also spot-on. Avoid stacking washers or using thread tape.