Parts for your 2019 Holden Commodore-Manifold gasket

2019 Holden Commodore manifold gasket — what it does, and when to sort it

Yes, a manifold gasket is relevant on the 2019 Holden Commodore (ZB). Holden/Opel workshop information for the Insignia B/Commodore platform lists intake manifold gaskets on all engines, and GM Service Information for the 2.0‑litre turbo petrol and 2.0‑litre turbo‑diesel specifies exhaust/turbo–manifold gaskets that must be renewed on removal. GM Powertrain’s technical overview for the 3.6‑litre LGX V6 notes the exhaust manifold is integrated into the cylinder head (so there’s no separate exhaust manifold gasket at the head on V6s), but those engines still use an intake manifold gasket set. So, manifold gaskets absolutely apply to this model.

The manifold gasket’s day job is sealing. On the intake side it keeps unmetered air (and sometimes coolant, depending on design) from sneaking into the engine, which protects idle quality, fuel economy, and emissions. On the exhaust side (or at the turbo flange on the 2.0T), it keeps hot gases contained so the oxygen sensors read correctly, the turbo spools properly, and there’s no sooty blow‑by or fumes in the bay.

There’s no fixed service interval for these gaskets, they’re replaced when they leak or whenever the manifold or turbo is removed. Typical signs include a hissing or whistling noise, rough idle, lean mixture fault codes, a ticking exhaust leak on cold start, visible soot at a joint, or lazy boost on the 2.0T. If any of that shows up, it’s time for a pressure/smoke test and a look at the sealing faces.

Good practice on the ZB Commodore is to fit new genuine or quality aftermarket gaskets any time the manifold comes off, clean the mating surfaces, and follow the torque specs and sequence in Holden/GM SI. On plastic intake manifolds, check for warpage and brittle PCV fittings. For the 2.0‑litre turbo, replace the turbo/manifold gasket and the one‑time‑use fasteners, heat cycles are brutal there. On the V6, remember there’s no separate exhaust manifold gasket at the head, but the intake gasket still needs the same care.

• Watch for vacuum leaks after any under‑bonnet work, a quick smoke test saves time.
• Avoid driving long with an exhaust leak — it can skew sensor data and cook nearby components.
• Parts vary by engine, so match by VIN to get the right gasket set.

Popular questions

Does my 2019 Commodore have an exhaust manifold gasket?
It depends on the engine. The 2.0‑litre turbo petrol and 2.0‑litre turbo‑diesel use gaskets at the exhaust/turbo manifold joints. The 3.6‑litre V6 integrates the exhaust manifold into the cylinder head, so there’s no separate head‑to‑manifold gasket on that engine, but it still uses intake manifold gaskets.

How much does manifold gasket replacement cost on a 2019 Commodore?
Costs vary with engine and access. Intake manifold gasket jobs are often 1–3 hours of labour, exhaust/turbo manifold work can run 3–5 hours. In Australia or New Zealand, expect roughly $200–$450 for an intake gasket job and $500–$1,200 for exhaust/turbo‑side work, parts and labour dependent on engine and workshop rates.

Is it safe to drive with a leaking manifold gasket?
Short trips might be ok, but it’s not ideal. Intake leaks can make the engine run lean and cranky, exhaust leaks can allow fumes into the bay and upset sensor readings. Best to book it in and get it sealed up promptly.