Parts for your 2000 Subaru Forester-Head gasket

2000 Subaru Forester head-gasket — what it does and how to look after it

Technical sources confirm the 2000 Subaru Forester does use a head gasket. The Subaru Factory Service Manual for MY2000 Forester (EJ-series engines) specifies the cylinder head gasket between the head and block, and Subaru Technical Service Bulletin 09-36-03 discusses external coolant leakage from head gaskets on Phase II 2.5L engines used in many 2000 Foresters. Subaru parts catalogues for EJ20/EJ25 variants also list the head gasket as a service component.

On a 2000 Forester, the head gasket’s job is pretty straightforward but absolutely vital. It seals the combustion chambers so the engine can hold compression, and it keeps engine oil and coolant in their own lanes. When it’s doing its thing, the motor runs smoothly, stays cool, and doesn’t drink fluids it shouldn’t.

These Subarus are loved for their reliability, but anyone who’s been around EJ engines knows head-gasket health deserves attention—especially on Phase II 2.5-litre SOHC models common in this year. Subaru even issued a bulletin and a genuine cooling-system conditioner for minor external coolant seep on those engines. Whether it’s an EJ25 or an EJ20 in your AU/NZ-market Forester, keeping the gasket happy comes down to smart servicing.

Good practice during regular servicing:

• Use fresh, Subaru-approved coolant at the correct mix, and replace the radiator cap and thermostat with quality OE-spec parts when due.
• Watch for dampness or crusty residue along the head-to-block seam, unexplained coolant loss, sweet smells, bubbles in the overflow, or overheating on long climbs.
• Avoid overheating at all costs—temperature spikes are the gasket’s worst enemy.

If replacement is on the cards, it’s an engine-out job on these boxers, so it pays to bundle in sensible extras: timing belt, water pump, idlers, cam and crank seals, and valve cover gaskets. Choose the latest-spec multi-layer steel head gaskets from a reputable brand or genuine Subaru. Have a machine shop check head flatness, only skim if outside spec. Subaru head bolts are typically reusable if they measure up, but many techs opt to replace them. Follow the factory tightening sequence and angles precisely—guesswork isn’t your mate here.

Looked after with proper coolant and regular checks, a fresh head-gasket job on a well-maintained 2000 Forester should deliver many more years and kilometres of dependable running, whether it’s carting the kids, the surfboards, or the camping kit.

• What are common symptoms of a failing head gasket on a 2000 Subaru Forester?
  Owners often notice slow external coolant seep at the head-to-block seam, a sweet coolant smell after a drive, or a dropping overflow bottle level. In more advanced cases, there can be misfires on cold start, overheating under load, white steam from the exhaust, or milky contamination under the oil cap. Catching it early usually keeps repairs simpler and cheaper.
• Should a cooling-system conditioner be used?
  Subaru issued a conditioner for Phase II 2.5L engines of this era to reduce minor external seep. If the vehicle matches that criteria, many workshops in Australia and New Zealand still use the genuine additive during coolant service. It’s not a cure for a blown gasket, but it can help slow a mild external leak. Always stick with the right coolant and bleeding procedure.
• How long does a replacement head gasket last?
  With quality MLS gaskets, proper prep, and good cooling-system maintenance, it’s common to see well over 100,000–160,000 km from a replacement. Longevity depends on factors like driving habits, cooling health, and whether the heads and mating surfaces were checked and prepped correctly at the time of repair.