Parts for your 2020 Holden Colorado-Head gasket

2020 Holden Colorado Head Gasket — What It Does and When It Needs Attention

Yes, the 2020 Holden Colorado (RG series) with the 2.8‑litre Duramax (RPO LWN) turbo‑diesel engine uses a cylinder head gasket. This is confirmed by GM/Holden service information covering cylinder‑head removal and installation procedures, and by ACDelco/GM Genuine Parts catalogues listing a head gasket and torque‑to‑yield head bolts for the 2.8 Duramax. Those technical sources make it clear the head gasket is a relevant service item on this ute.

The Colorado’s head gasket sits between the cast‑iron block and alloy cylinder head, sealing combustion pressure while keeping coolant and engine oil in their own passages. On the 2.8 Duramax it’s a multi‑layer steel (MLS) design engineered to handle high compression and boost. Without it, you’d cop compression leaks, coolant in the oil, or oil in the coolant, and a bad day under the bonnet.

As part of regular servicing, the focus isn’t on replacing the head gasket proactively, it’s on preventing the conditions that kill gaskets. That means staying on top of the cooling system: correct long‑life coolant type and strength, timely coolant changes per the owner’s manual, a healthy radiator and fan clutch, and no air locks after any cooling work. Avoid overheating at all costs—diesels can spike head temps quickly when towing or working hard.

If a head gasket job is on the cards, the workshop will check for tell‑tales first: pressure in the cooling system when cold, white exhaust smoke, unexplained coolant loss, mixing of oil and coolant, overheating or rough starting. A proper diagnosis can include cooling‑system chemical tests, cylinder‑leak checks, and a scan of ECT/EGT behaviour.

Replacement on the 2.8 Duramax is a precision task. Expect:

• Cylinder‑head flatness checks and a pressure test, machine if required within spec.
• New MLS head gasket matched to the correct thickness grade.
• New torque‑to‑yield head bolts tightened in the factory sequence and angle stages.
• Meticulous cleaning of mating surfaces, and fresh coolant and oil with new filters.

Good workshops will also eyeball the EGR cooler, water pump, thermostat, and hoses while they’re in there. For owners, the best “maintenance” for a head gasket is simple: keep the cooling system spot‑on, fix leaks early, don’t tune it recklessly for boost, and give the ute a cool‑down after hard towing. Done right, the Colorado’s head gasket is built to go the distance across Aussie and Kiwi kilometres.

Does the 2020 Holden Colorado have a head gasket?

It does. The 2.8‑litre Duramax (LWN) turbo‑diesel uses an MLS head gasket between the block and alloy head. GM/Holden service procedures and ACDelco parts listings specifically cover the head gasket and head bolts for this engine.

What are the common signs of a blown head gasket on a Colorado 2.8?

Watch for unexplained coolant loss, pressurised hoses when cold, white exhaust smoke, milky oil, oily coolant, overheating, or rough cold starts. A cooling‑system chemical test and leak‑down check help confirm it before any big repairs.

How can owners help prevent head gasket issues?

Stick to the correct long‑life coolant and change intervals, bleed the system properly after work, keep the radiator and fan clutch healthy, and avoid overheating—especially when towing. Sensible tuning and cool‑down after hard runs also protect the gasket.