Parts for your 2016 Holden Colorado-Head gasket

2016 Holden Colorado head gasket — what it does and when to replace it

Yes, the 2016 Holden Colorado uses a cylinder head gasket and it’s absolutely relevant to this model. Technical documentation that covers the RG-series Colorado (MY16) — including the Holden Colorado RG Workshop Manual (Engine Mechanical — 2.8L Diesel, RPO LWN), GM Global Propulsion Systems service information for the 2.8L Duramax LWN engine, and the Holden/GM EPC listing of a dedicated cylinder head gasket for the RG Colorado — all confirm the gasket’s fitment and the factory torque/angle procedure.

On the 2.8‑litre Duramax turbo-diesel, the head gasket is a multi-layer steel seal that sits between the cast-iron block and aluminium cylinder head. Its job is to keep combustion pressure where it belongs, while also keeping coolant and engine oil in their own passages so they don’t mix. With diesel’s higher compression and boost, sealing demands are tough, that’s why correct surface finish, bolt replacement and the specified torque-angle sequence matter.

There’s no scheduled replacement for a head gasket — it’s a replace-on-failure part — but staying on top of cooling system health dramatically reduces risk. Overheating is public enemy number one for gasket life.

• Watch for warning signs: unexplained coolant loss, overheating, white exhaust smoke on warm engine, sweet smell from exhaust, pressurised hoses when cold, rough cold starts, or milky residue under the oil cap.
• Service tips: use the correct OAT coolant spec, maintain the proper mix, replace coolant per the Holden logbook, and don’t ignore a sticking thermostat, weak radiator cap, or a weeping water pump. If towing or working hard in hot conditions, ensure the radiator, fan and intercooler are clean and airflow is unobstructed.

If a leak is suspected, a workshop should carry out a cooling system pressure test, a chemical block test for combustion gases in the coolant, and compression or leak-down testing. If replacement is needed, the cylinder head should be crack-tested and checked for flatness, machining and valve work may be required. The correct head gasket thickness must be selected per service info, and the torque-to-yield head bolts must be replaced. It’s good practice to renew intake/exhaust gaskets, injector seals (where applicable), turbo feed/return washers, coolant, engine oil and filter. After reassembly, the cooling system needs a proper vacuum fill or careful bleed, with checks after the first heat cycle for any seepage or hose clamp relaxation.

Done right, a fresh head gasket on a well-maintained Colorado 2.8 can go the distance — keep the cooling system happy and it’ll return the favour.

Popular questions about the 2016 Holden Colorado head gasket

What are the common symptoms of a blown head gasket on a 2016 Colorado?
Owners usually report persistent coolant loss with no obvious leak, overheating under load, white exhaust smoke once warm, hard cold starts, or a cooling system that stays rock-hard when the engine is cold. Oil contamination (milky residue) or oily sheen in the coolant can also appear, though not in every case.

A proper diagnosis is essential — workshops will use a pressure test, a block test for combustion gases, and compression or leak-down testing to confirm before tearing the engine down.

Can someone keep driving a Colorado with a suspected head gasket leak?
It’s risky. Even a small leak can rapidly escalate to overheating, warped heads, or bottom-end damage. If it must be moved, short, gentle trips only — keep an eye on temperature and coolant level — but the smart move in Aus/NZ is to get it towed to a workshop and tested.

How much does a head gasket replacement cost and how long does it take?
For the 2.8L Duramax, typical workshop times land around 10–16 labour hours, depending on diagnostics, machining, and how many ancillaries need attention. In Australia or New Zealand, that often totals around AUD/NZD $2,000–$4,500, varying with parts quality, machine shop work, and regional labour rates.

A thorough job includes new torque-to-yield head bolts, a quality gasket set, fluids, and post-repair checks — paying for the right parts and steps helps avoid doing it twice.