Parts for your 2020 Holden Commodore-Suspension bushes

2020 Holden Commodore (ZB) suspension bushes

Suspension bushes are absolutely used on the 2020 Holden Commodore (ZB). Technical references that confirm the vehicle’s use of bonded rubber and hydro-filled bushes include: GM Global Service Information (GMSi) for ZB Commodore front and rear suspension description/operation, Holden Genuine Parts Catalogue listings for front lower control arm bushes, rear suspension arm bushes and rear subframe bushes, the Opel Insignia B (the ZB’s donor platform) workshop manual, and fitment catalogues from major aftermarket suppliers that offer replacement bush kits for the ZB/Insignia B platform.

On this Commodore, bushes sit wherever arms and the subframe meet the body, helping locate the control arms while soaking up vibration. Up front, the MacPherson strut lower control arms use large, voided or hydro-type bushes to steady braking and sharpen steering feel. Down the back, the five-link independent setup relies on multiple arm bushes and subframe mounts to keep toe and camber stable as the wheels move. In short, bushes are the quiet achievers—reducing noise and harshness while keeping alignment true and tyre wear even.

Owners will notice worn bushes as clunks over bumps, vague steering, shudder under braking, or inside-edge tyre wear. As part of regular servicing, it’s smart to inspect them every 20,000 km or 12 months: look for cracking, splits, torn voids, oil swelling, or delamination from the sleeves. A lever test on control arms can reveal excess play, and any hydraulic bush seepage is a clear replacement call.

When replacement’s due, doing bushes in axle pairs keeps handling balanced. OEM-style rubber maintains the Commodore’s comfort and NVH, while quality polyurethane options can tighten response at the cost of a touch more road feel. Always torque bush bolts at normal ride height so the rubber isn’t pre-loaded, and book a four-wheel alignment straight after. Where the manual specifies single-use bolts or nuts (common on subframes and control arms), replace them. A press is often required, so many owners leave the job to a workshop with the right jigs.

Driven on Aussie and Kiwi roads, factory bushes can last 80,000–150,000 km depending on loads and conditions. Avoid soaking them in oils or solvents, keep tyres correctly inflated, and sort any knock or pull early—healthy bushes keep the ZB feeling planted and confident.

• Technical sources referenced: GM GMSi (ZB suspension descriptions), Holden Genuine Parts Catalogue (ZB bush listings), Opel Insignia B workshop manual, major aftermarket bush catalogues for ZB/Insignia B.

FAQs

How often should the suspension bushes be replaced on a 2020 Holden Commodore?
There’s no fixed interval—bushes are wear items. Many last 80,000–150,000 km, but rough roads, heavy loads or performance driving can shorten that. Inspect them every 20,000 km or annually and replace when cracked, loose, leaking (for hydro bushes) or causing alignment/tyre wear issues.

Can polyurethane bushes be fitted to a ZB Commodore, and what’s the trade-off?
Yes. Polyurethane options are available for key arms and subframe points. They generally sharpen steering and reduce compliance under load, but can pass a bit more vibration into the cabin. For daily comfort, OEM rubber is great, for sportier feel, quality poly is a solid upgrade.

Do bushes need replacing after a big pothole or kerb hit?
Not always, but any heavy impact warrants a check. Look for torn rubber, shifted arms, or a steering pull. If alignment won’t hold or there’s a new noise, the affected bush (or accompanying arm/ball joint) may need replacement followed by a proper alignment.