Parts for your 2014 Subaru Legacy-Head gasket

2014 Subaru Legacy head gasket: what it does and when to sort it

Yes, the 2014 Subaru Legacy uses head gaskets. The Subaru Factory Service Manual for the 2014 Legacy/Outback (Engine sections for FB25 and EZ36) and Subaru’s genuine parts catalogue both list cylinder head gaskets for these engines. The FB25 2.5‑litre flat‑four uses multi‑layer steel (MLS) gaskets, and the EZ36 3.6‑litre flat‑six uses a pair as well—one per bank—so the part is absolutely relevant on this model.

On a boxer engine like the Legacy’s, the head gasket sits between each cylinder head and the engine block. Its job is to keep three things perfectly separated: high‑pressure combustion, engine oil, and coolant. A healthy gasket locks in compression for strong, efficient power whilst preventing oil and coolant from mixing or leaking. Because the engine lies flat, good sealing on each side is extra important.

Even with modern MLS gaskets, age, heat cycles, or cooling system neglect can cause trouble. Early warning signs owners and technicians watch for include:

• Unexplained coolant loss, sweet exhaust smell, or white steam from the tailpipe
• Overheating, hard upper radiator hose after cool‑down, or bubbles in the header tank
• Oil seepage at the head‑to‑block seam, or milky residue under the oil cap
• Rough cold starts or misfires that clear as it warms

When replacement is due, best practice on these Subarus is engine‑out for access, fit OEM‑grade MLS gaskets, follow the FSM torque/angle sequence precisely, and use new head bolts as specified. Heads should be checked for flatness and surface finish, with machining if needed. It’s smart to refresh the thermostat, radiator cap, and any tired hoses. On FB25 and EZ36 (both timing‑chain engines), the water pump and accessory drive components are worth assessing while access is good.

Preventative care goes a long way. Stick to Subaru‑approved long‑life coolant and the maintenance intervals in the service schedule used in Australia and New Zealand, ensuring proper bleeding to avoid air pockets. Keep oil services on time, and fix any minor leaks promptly so the system stays clean and stable. A quick look under the bonnet for crusted coolant, oil weeps, or low expansion tank level during regular servicing helps catch small issues before they become big, expensive ones.

• Does the 2014 Legacy still have the “Subaru head gasket problem”?
  Later engines like the FB25 and EZ36 use improved MLS gaskets and revised cooling/oiling, so failures are far less common than the old EJ‑series era. With correct coolant, proper bleeding, and routine servicing, many run high kilometres without drama.
• What does a head gasket job typically cost in AU/NZ, and how long does it take?
  Expect roughly AUD/NZD $2,000–$4,500 depending on engine (2.5 vs 3.6), machining needs, and what’s refreshed while in there. Labour is commonly 10–18 hours on a boxer, plus parts, fluids, and any extras like thermostat or hoses.
• Is it safe to keep driving with a minor head gasket leak?
  Not ideal. Combustion gases in the cooling system can trigger sudden overheating and engine damage. If it must be driven to a workshop, keep trips short, watch the temperature gauge, and avoid heavy loads—but the wisest move is prompt repair.