Parts for your 2005 Toyota Highlander-Head gasket

2005 Toyota Highlander (Kluger) Head Gasket — Purpose, care, and when to replace

Based on Toyota’s factory Repair Manual for the 2005 Highlander/Kluger (Engine Mechanical — Cylinder Head) and the Toyota Electronic Parts Catalogue, this model absolutely uses a head gasket. Both engines fitted in 2005 — the 2.4‑litre 2AZ‑FE four‑cylinder and the 3.3‑litre 3MZ‑FE V6 — are designed with a multi‑layer steel (MLS) head gasket between the aluminium cylinder head and block.

On a 2005 Highlander, the head gasket’s job is straightforward but critical: it seals combustion pressure while keeping engine oil and coolant in their own passages. That thin MLS sandwich cops huge heat cycles and clamping loads, so it has to be spot‑on to keep the engine running sweet and efficient. When it’s healthy, you get proper compression, no coolant sneaking into the cylinders, and no oil mixing with coolant.

There’s no routine “service” for a head gasket — it’s a replace‑on‑failure item — but good habits massively reduce the odds of drama. Keeping the cooling system in top nick is the big one: use the correct Toyota Super Long Life Coolant (pink), replace it at the recommended intervals, and make sure the radiator, fans, thermostat and cap are up to scratch. Don’t ignore overheating