Parts for your 2017 Holden Commodore-Head gasket

2017 Holden Commodore head gasket: what it does and when to sort it

Based on Holden and GM technical references, a head gasket is very much relevant to the 2017 Holden Commodore. The VF Series II models run conventional multi-cylinder petrol engines — the 3.6‑litre V6 (LFX) and the 6.2‑litre V8 (LS3) — each using a multi‑layer steel (MLS) head gasket between the cylinder head and engine block. This is documented in the Holden VF Series II Commodore Service and Repair Manual (Engine Mechanical: Cylinder Head and Gasket procedures), GM Global Service Information (GSI) for LFX/LS3, and the ACDelco/GM OE parts catalogue listing head gaskets and single‑use head bolts for these engines.

The head gasket’s job is simple but critical: it seals combustion pressure in the cylinders while keeping engine oil and coolant in their own passages. It cops constant heat cycles and high pressure, so quality and correct fitment matter. On the 2017 Commodore, the MLS design handles expansion and contraction nicely, helping maintain compression and preventing coolant‑into‑oil dramas or external leaks.

There’s no set “service” interval for a head gasket — it’s a fix‑when‑needed part. Good servicing keeps it happy: correct Dex‑Cool–type long‑life coolant, fresh coolant at the recommended interval, a healthy radiator cap, proper thermostat operation, and a cooling system free of air. Keeping an eye on temps, especially on hot Kiwi and Aussie summer runs or towing, pays off too.

• Early warnings to watch: unexplained coolant loss, overheating, sweet‑smelling exhaust, misfire on start‑up, milky residue under the oil cap, pressurised hoses when cold, or creamy coolant.
• Prevention tips: fix small leaks early, keep the cooling fans and radiator clean, and use the correct coolant mix.

If replacement is needed, it’s a proper top‑end job. The service information specifies removing the cylinder heads, checking flatness, and using new torque‑to‑yield head bolts with the exact torque‑angle sequence. Surfaces must be spotless and dry, and any warped head should be machined by a reputable shop. Owners are best to choose a genuine or high‑quality MLS gasket set and follow the Holden/GM torque specs to the letter. Given the labour involved, most will hand this to an experienced technician, it’s a big job, but done right, it’ll restore compression, stop cross‑leaks, and keep the Commodore running sweet for many more kilometres.

Popular questions about 2017 Holden Commodore head gaskets

Does a 2017 Holden Commodore actually have a head gasket?
Yes. Both the 3.6‑litre V6 (LFX) and 6.2‑litre V8 (LS3) use an MLS head gasket. This is outlined in Holden’s VF Series II service procedures and backed by GM/ACDelco parts listings for head gaskets and single‑use head bolts for these engines.

What are the common signs the head gasket may be failing?
Typical signs include overheating, unexplained coolant loss, white exhaust vapour after warm‑up, milky oil, bubbly expansion tank, hard upper radiator hose when cold, and rough start misfires. A chemical block test or cylinder leak‑down can confirm suspicion before pulling the heads.

How can owners reduce the chance of head gasket trouble?
Sticking to proper coolant type and intervals, fixing leaks quickly, keeping the radiator and fans clean, and avoiding prolonged overheating are key. On higher‑load driving (towing, hot days), giving the engine a gentle cool‑down and watching the temp gauge helps protect the gasket and heads.