Parts for your 2016 Subaru Impreza-Head gasket

2016 Subaru Impreza head gasket – what it is, what it does, and when to act

Yes, a head gasket is fitted to the 2016 Subaru Impreza. Technical documentation such as the Subaru Factory Service Manual for the 2016MY Impreza (Engine – FB series) and the Subaru parts catalogue list a cylinder head gasket for the FB20 2.0‑litre boxer engine. Those sources specify a multi‑layer steel (MLS) gasket that seals each cylinder head to the aluminium engine block, so the component is absolutely relevant on this model.

On the 2016 Impreza, the head gasket’s job is to keep combustion pressure in, while keeping engine oil and coolant in their own lanes. It has to hold back high cylinder pressures, hot exhaust gases, and deal with constant heat cycles. Subaru’s FB‑series MLS design is far more robust than older generations, which is why head‑gasket trouble is much less common on these later cars when they’re serviced on time.

It’s not a scheduled maintenance item like oil or coolant, but it benefits from good habits. Keeping the cooling system healthy is the best prevention: use the correct Subaru‑approved long‑life coolant, refresh it on time, and never ignore an overheating event. Watch for leaks, a tired radiator cap, or a sticky thermostat, because heat is the enemy of any head gasket.

• Typical warning signs: unexplained coolant loss, white steam from the exhaust once warm, bubbles in the overflow bottle, milky oil, rough cold starts, sweet coolant smell, or persistent overheating.
• Useful checks: coolant chemical “block” test, cooling‑system pressure test, and compression or leak‑down testing. Qualified workshops will also check for hydrocarbon traces in the cooling system.

If replacement is required, best practice is a proper strip‑down with clean mating surfaces, measurement of head flatness, and installation of a new MLS gasket with new head bolts as specified by Subaru. Because the FB20 is a flat‑four with two cylinder heads, many technicians recommend doing both sides if one has failed to save on duplicated labour. It’s also a good time to service related items like the water pump, thermostat, and timing components if due, so the car leaves with a fresh cooling system and fewer future surprises.

Looked after with regular servicing and sensible driving, a 2016 Impreza can clock plenty of kilometres without head‑gasket drama. The key is keeping it cool, clean, and checked.

FAQs

How long does a 2016 Impreza head gasket usually last?
On well‑maintained FB20 engines, the factory MLS head gaskets often last the life of the engine. Failures are uncommon compared with older EJ‑series Subarus. Heat stress or chronic coolant neglect is what typically shortens their life.

What are the first signs my 2016 Impreza’s head gasket might be failing?
Early clues include gradual coolant loss with no visible leak, intermittent overheating, bubbles in the overflow, a sweet smell from the exhaust, or a rough idle on cold starts. Catching these signs early can keep repair costs down.

Should both head gaskets be replaced if one fails?
Many workshops recommend doing both sides on the FB20 while the engine is out, as labour overlaps significantly. It’s not mandatory if the other bank tests fine, but it’s a practical way to avoid another teardown later.