Parts for your 2006 Holden Commodore-Sump plug washers

2006 Holden Commodore sump plug washers — what they do and when to replace them

Based on Holden’s VZ and VE Service Manuals (Engine Mechanical – Lubrication), the GM Holden electronic parts catalogue for the 2006 model year, and mainstream aftermarket catalogues (ACDelco/GM Genuine and local parts listings), the 2006 Holden Commodore does use a sealing device on the engine oil drain plug. Depending on the variant, this is either a separate crush washer (commonly copper or aluminium) or a drain plug with a captive/bonded gasket. So, sump plug washers are relevant and fitted on 2006 Commodore engines, including the Alloytec V6 and LS-series V8s.

On this Commodore, the sump plug washer’s whole job is simple but crucial: it seals the drain plug to the sump so oil doesn’t seep out between services. A soft metal crush washer deforms once to take up tiny imperfections, while plugs with a bonded rubber or nylon gasket compress to create a reliable seal. That seal helps maintain correct torque without over-tightening, protects the sump face (especially on alloy pans), and prevents those annoying drips on the driveway.

As part of routine servicing, it’s best practice to renew the washer every oil change. Holden’s factory material specifies replacing sealing washers/gaskets when refitting the plug, aftermarket guidance says the same. If your plug uses a bonded seal, replace the plug or the gasketed ring once it’s flattened, nicked, or hardened. Typical torque for these plugs is in the mid‑20s Nm range, but always follow the specific figure for the engine in the service manual to avoid stripping threads or under-clamping the seal.

Washer size depends on engine family. Many Alloytec V6 variants use a 14 mm plug/washer, while LS V8s often use a 12 mm setup. Check by VIN/engine code or measure the plug shank to match the correct washer material and diameter. Go for quality copper or aluminium crush washers, or genuine-style gasketed plugs, rather than reusing a tired seal.

Signs a new washer is due right away include a damp halo around the plug after a drive, oil spots under the car overnight, or a plug that feels secure but still weeps. Keep a couple of spare washers in the glovebox, and you’ll never be stuck mid-service.

• Replace the washer at every oil change
• Match washer size/material to engine and plug type
• Tighten to the service manual torque spec

FAQs

Do all 2006 Commodores need a new sump plug washer at every service?
Yes. Whether it’s a copper/aluminium crush washer or a plug with a bonded gasket, treat it as a consumable. It’s cheap insurance against leaks, rounded plugs, and damaged sump faces.

What size washer does a 2006 Commodore use?
Most Alloytec V6 models use a 14 mm washer, while LS V8s commonly use 12 mm. Always confirm by VIN/engine code or measuring the plug to avoid a poor seal or cross‑fit.

Can the old washer be reused?
Not recommended. Crush washers are one‑time use by design, and bonded gaskets lose elasticity after being compressed and heat-cycled. Reusing them is a common cause of slow leaks.