2009 Subaru Forester (SH) · Known Issue
2009 Subaru Forester Head Gasket Failure (EJ25): What It Really Costs to Fix
Quick answer: Expect $1,500–$2,800 at an independent shop depending on which component failed. Full breakdown, symptoms, and how to spot it before you buy below.
What the Issue Is
The EJ25 head gasket is Subaru folklore made invoice: the 2.5-liter boxer's composite gaskets fail external-leak-style across the engine's long service life — oil and coolant weeping from the head-block seams low on each side, typically announcing between 100,000 and 150,000 miles — with the boxer layout's horizontal seams and the era's gasket material sharing blame. Coolant-side leaks escalate toward overheating; oil-side ones toward smell-and-drip squalor; and the repair, engine-out or engine-tilted on most applications, prices the labor accordingly.
The aftermarket's multi-layer-steel gasket solutions outperform the originals decisively, making done-right-once the operative repair standard — commonly bundled with timing belt, water pump, and seals while access is paid for, the everything-while-in-there package that transforms a failure into a renewal.
Used-market navigation splits on that surgery: gasket-done Foresters (MLS gaskets, bundled service, receipts) are the platform at its durable best, while original-gasket high-milers carry the invoice's shadow at whatever discount honesty sets. The underside inspection reads the seams directly, keeping this among the most verifiable major issues in the guide.
Symptoms to Watch For
- 1.Oil or coolant weep at the head-block seams (low on each side)
- 2.Coolant loss with sweet smell after drives
- 3.Oil-drip squalor on the lower engine and crossmember
- 4.Overheating episodes (coolant-side escalation)
- 5.Bubbling in the overflow tank under load (advanced)
Real Repair Costs
Independent-shop pricing for MLS-gasket repair, typically bundled with timing belt, water pump, and seals given shared access — the standard done-right package.
| Repair | Typical Cost (installed) |
|---|---|
| Head gaskets (MLS), installed | $1,500–$2,200 |
| With timing belt + water pump + seals bundlethe while-in-there standard | $1,900–$2,800 |
Major issue — budget for it. Ranges are US independent-shop estimates with quality parts — use them as negotiation grounding, not a quote.
Mechanic's Tip: Spot It Before You Buy
Read the seams with a flashlight from below: EJ25 gasket failure advertises at the head-block junctions — oil-side grime beards and coolant-side crusty trails low on each cylinder bank — long before catastrophic symptoms. Cross-check the overflow tank's level and crust history, and sniff for coolant after the drive. Then the decisive question: gaskets ever done, with what (MLS receipts being the golden answer), and was the timing-belt-water-pump bundle included? Gasket-done examples buy Subaru longevity honestly; original-gasket 130k cars price the $1,900–$2,800 package into every negotiation.
The Bigger Ownership Picture
Beyond this specific issue, budget roughly $1,000–$1,500 per year for scheduled maintenance and likely out-of-warranty repairs on a 2009 Subaru Forester — based on Avturo's ownership-cost dataset, calibrated against Edmunds True Cost to Own and RepairPal. That excludes insurance, fuel, and financing.
Frequently Asked Questions
Do all EJ25 Subarus blow head gaskets?▼
Enough that the community treats it as scheduled: external-leak failures across the engine's 1999–2010ish applications commonly arrive at 100,000–150,000 miles. Survivor variance exists — but purchase math should assume the gasket event either documented-past or priced-future on any original-gasket example.
What does the Subaru head gasket job cost?▼
$1,500–$2,200 for MLS-gasket repair at independents, $1,900–$2,800 with the standard timing-belt, water-pump, and seals bundle that shared access makes rational. The MLS upgrade outlasts original-style gaskets decisively — done-right-once is the operative standard.
Can I drive with a weeping head gasket?▼
Oil-side weeps tolerate months of monitored squalor; coolant-side ones escalate on their own schedule toward overheating and deserve prompt scheduling with level vigilance in between. Bubbling overflow tanks and temperature drama mark the drive-directly-to-the-shop stage. The failure's external nature is the mercy; overheating squanders it.
Are gasket-done Foresters good buys?▼
Among the platform's best: MLS-repaired engines with bundled service have retired the model's defining liability and typically signal ownership quality broadly. The receipts are the asset — verify gasket type and bundle scope — and price such examples above original-gasket peers with confidence.
The Same Problem on Other Cars
Comparing candidates? These models have documented head gasket failures too:
Researching other vehicles? Browse known problems and repair costs for 50 popular models →
Checking out a listing for a Subaru Forester?
Run it through Avturo — we'll check whether the price already reflects risks like head gasket failure (ej25), pull the market comps, and flag the red flags before you drive out to see it.
Analyze a Listing Free →