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Subaru EZ36 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The Subaru EZ36 is a 3.6-litre naturally aspirated flat-six boxer engine - Subaru's largest and most powerful production engine, serving as the flagship powerplant for the Legacy, Outback and Tribeca from 2008 to 2019. Reconditioned units from £3,200 - Subaru's premium H6 engine offering smooth, effortless power.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£2,200
Reconditioned from
£3,200
Rebuilt from
£4,500
GB
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Key Specs
Subaru EZ36 - Specifications at a Glance
Engine Code
EZ36 (EZ36D)
Fuel
Petrol
Configuration
3.6L naturally aspirated flat-six (Boxer), DOHC 24-valve
Power Output(s)
250-260 hp (184-191 kW) depending on market and year
Torque
335-350 Nm
Years Produced
2008-2019
UK Models Fitted
4 models - full list in Compatibility below
2025 UK Replacement Requests
[Not in proprietary data - see compatibility demand]
Replaced
EZ30 (3.0L H6)
Replaced By
- (discontinued; replaced by turbocharged FA24 in some markets)
Most Common Failure
Overheating / cooling system / timing chain tensioner
Reconditioned Price Range
£3,200-£4,500 supply-only
Vetted UK specialists for EZ36 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Subaru Models Use the EZ36-
The EZ36 was Subaru's flagship engine, introduced in the 2008 Subaru Tribeca and subsequently offered as the top-tier powertrain in the Legacy and Outback ranges. It was the largest production engine Subaru ever built and represented the pinnacle of Subaru's naturally aspirated engineering.
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 Subaru Tribeca | WX (first generation) | 3.6R | 2008-2014 | |
| Subaru Legacy | BM/BR (fifth generation) | 3.6R | 2009-2014 | |
| Subaru Legacy | BN/BS (sixth generation) | 3.6R | 2014-2019 | |
| Subaru Outback | BR (fourth generation) | 3.6R | 2009-2014 | |
| Subaru Outback | BS (fifth generation) | 3.6R | 2014-2019 |
02
Subaru Legacy
03
Subaru Legacy
04
Subaru Outback
05
Subaru Outback
CROSS-BRAND
EZ36 is documented across 5 BMW applications spanning Subaru Tribeca, Subaru Legacy, Subaru Outback. Registration lookup confirms the exact suffix before quotes are sent.
Not sure which engine your car has?
Not sure which engine your car has- Enter your registration above - we'll confirm your exact EZ36 fitment before any quotes are sent.
Prices
Subaru EZ36 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £2,200-£3,200 | £3,100-£4,200 | 3-6 months |
Reconditioned | £3,200-£4,500 | £4,200-£5,700 | 12-24 months |
Rebuilt | £4,500-£6,500 | £5,500-£7,800 | 12-24 months |
All . Fitted = supply price + labour band below.
Labour Guide
Fitting an EZ36 typically takes 12-16 hours at £65-£85/hr (independent Subaru specialist) - the flat-six layout requires more labour than the four-cylinder engines. A full rebuild can consume 20-30 hours of workshop time. Confirm exact labour when comparing quotes.
Price Factors
What genuinely moves the price for THIS engine: whether the engine is the earlier EZ36 (2008-2014, 5-speed auto) or the later EZ36 (2014-2019, 6-speed CVT) - the CVT variant requires specific engine configurations. The condition of the timing chain tensioner and cooling system components significantly affects used prices. See our full reconditioned engine cost guide.
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Common Problems
Subaru EZ36 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the EZ36, based on real-world data and verified failure patterns.
Verified issue focus: Overheating / cooling system / timing chain tensioner.
The EZ36 improved over its production run. The post-2014 EZ36 (BS Outback, BN Legacy) received revised ECU calibration and improved cooling system components. Unlike the EJ25, the EZ36 does not have a reputation for head gasket failure - Subaru uses MLS gaskets and the failure rate is "significantly low". However, the engine is intolerant of overheating and cooling system neglect.
Compare rebuilt EZ36 prices with the failures already addressed
Engine Variants
EZ36 Variants - Which One Is in Your Car-
INTRO: The EZ36 (also known as EZ36D) is a single engine family with two primary variants distinguished by the transmission they were paired with and minor ECU revisions. The differences matter when buying a replacement. ### EZ36D - 2008-2014 (pre-facelift) - Fitted to: Subaru Tribeca WX (2008-2014), Subaru Legacy BM/BR (2009-2014), Subaru Outback BR (2009-2014) - Key technical difference: 3.6-litre petrol F6, DOHC, 24-valve. Dual AVCS (Active Valve Control System) on intake and exhaust camshafts. Compression ratio: 10.5:1. Power: 260 ps (191 kW) at 5,600 rpm. Torque: 350 Nm at 4,400 rpm. Paired with 5-speed automatic transmission. Die-cast aluminium block with 92.0 mm bores and 91.0 mm stroke. Features asymmetrical connecting rods for compact packaging. Timing chain (three chains) - no belt. Weight: 185 kg. - Sub-code-specific failure note: Cooling system failures are the primary concern on this variant. The 5-speed auto transmission can also contribute to higher engine load and heat. - Interchange note: Direct swap with post-2014 EZ36D requires ECU reflash and may need different transmission ancillaries. Ensure the replacement matches your model year and transmission type. ### EZ36D - 2014-2019 (post-facelift) - Fitted to: Subaru Legacy BN/BS (2014-2019), Subaru Outback BS (2014-2019) - Key technical difference: Same 3.6-litre petrol F6, DOHC, 24-valve. Power: 191 kW at 5,600 rpm. Torque: 350 Nm at 4,400 rpm. Paired with 6-speed CVT (Lineartronic) transmission. Revised ECU calibration and improved cooling system components. - Sub-code-specific failure note: Same cooling system and timing chain concerns as the earlier variant. The CVT transmission can place different load characteristics on the engine. Oil consumption can reach up to 1 litre per 2,000 km according to Subaru's official tolerance. - Interchange note: Not a straight swap with the 2008-2014 variant - ECU, transmission, and wiring loom differ significantly. Only replace with another post-2014 EZ36D.
The engine code is stamped on the top of the engine block, near the bellhousing mating face. It's also listed on the V5C registration document. For EZ36, look for the distinctive flat-six layout - it's visibly wider than the four-cylinder engines. Enter your registration above if you're unsure - we'll confirm your exact EZ36 variant before any quotes are sent.
Easily Confused
EZ30
- the 3.0-litre flat-six that preceded the EZ36. The EZ30 powered the Legacy 3.0R, Outback 3.0R, and earlier Tribeca models. The EZ36 replaced it with larger displacement, more torque, and improved cooling, while sharing the same basic architecture.
Alternative / Next-Gen Code
FA24
- The EZ36 was Subaru's last naturally aspirated six-cylinder engine. It was discontinued in 2019 with no direct replacement. The (2.4-litre turbo) effectively took its place in the performance hierarchy, offering similar power with better fuel economy.
Related JLR Variants
EJ25
- the 2.5-litre four-cylinder that coexisted with the EZ36. The EJ25 was Subaru's mainstream engine; the EZ36 was the premium flagship option. Both are boxers, but the EZ36 is significantly smoother and more powerful.
Confirm the exact EZ36 fitment
The engine code is stamped on the top of the engine block, near the bellhousing mating face. It's also listed on the V5C registration document. For EZ36, look for the distinctive flat-six layout - it's visibly wider than the four-cylinder engines. Enter your registration above if you're unsure - we'll confirm your exact EZ36 variant before any quotes are sent.
Buying Guide
Buying a Replacement EZ36 - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used EZ36 makes sense only if it comes with documented evidence of cooling system maintenance (water pump, thermostat, radiator replaced within the last 50k miles) and regular oil changes using the correct 5W-30 synthetic oil. The EZ36 is intolerant of overheating - any used engine without cooling system history is a high-risk purchase. The recommended oil capacity is approximately 6.3-6.9 litres with filter. Used JDM EZ36 engines are available from £2,200-£3,200.
Reconditioned:
A proper EZ36 recon addresses the known weak points: new timing chain tensioner and guides, new water pump, new thermostat, new cam carrier seals, and a thorough cooling system flush. A 12-month warranty is standard. Reconditioned units are the sweet spot for most owners - you get the reliability upgrades without the cost of a full rebuild.
Rebuilt:
A full EZ36 rebuild is justified when you own a high-value example (e.g., a well-specced Outback 3.6R or Tribeca) and want the engine to last another 150,000+ miles. An upgraded rebuild should include new piston rings (to address any oil consumption), new timing chain components, new cooling system components, and a thorough cylinder head inspection. For track use, consider an Accusump system or custom baffled oil pan to address oil starvation. Budget £4,500-£6,500 for a quality rebuild.
Supply & Fit Line:
All of our vetted UK Subaru specialists offer supply-only or full supply-and-fit - nationwide delivery and recovery available, with warranties that cover both parts and labour.
Vehicle Value Note:
The EZ36 sits in premium Subaru models - Outback 3.6R values range from £5,000-£18,000; Legacy 3.6R £4,000-£14,000; Tribeca £3,000-£8,000 depending on year and mileage. A reconditioned EZ36 at £3,200-£4,500 represents 20-50% of vehicle value - generally viable for most examples. However, for a high-mileage Tribeca (£3,000-£5,000), a full rebuild at £6,500 may exceed the vehicle's value. In those cases, evaluate the car's overall condition, rust, and transmission health before committing .
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Related Engines
Engines Related to the Subaru EZ36
Explore engines that are closely related to the Subaru EZ36, including its predecessor, successor, and key family variants.
Predecessor
EZ30
- the 3.0-litre flat-six that preceded the EZ36. The EZ30 powered the Legacy 3.0R, Outback 3.0R, and earlier Tribeca models. The EZ36 replaced it with larger displacement, more torque, and improved cooling, while sharing the same basic architecture.
Successor
FA24
- The EZ36 was Subaru's last naturally aspirated six-cylinder engine. It was discontinued in 2019 with no direct replacement. The (2.4-litre turbo) effectively took its place in the performance hierarchy, offering similar power with better fuel economy.
Sibling
EZ30
- the 3.0-litre H6 that shares the EZ family architecture. The EZ36 is essentially a stroked and bored version of the EZ30, with a larger bore (92.0mm vs 89.2mm) and stroke (91.0mm vs 80.0mm), resulting in an extra 0.6 litres of displacement and more low-end torque.
Sibling
EJ25
- the 2.5-litre four-cylinder that coexisted with the EZ36. The EJ25 was Subaru's mainstream engine; the EZ36 was the premium flagship option. Both are boxers, but the EZ36 is significantly smoother and more powerful.
Cross-Brand Twin
None
the EZ36 is Subaru-only, and was never fitted to any other manufacturer's vehicles.
FAQ
Subaru EZ36Frequently Asked Questions
Question 1How much does a Subaru EZ36 engine replacement cost-
A reconditioned EZ36 supply-only costs £3,200-£4,500, with fitted prices from £4,200-£5,700. Used units start from £2,200 supply-only. Rebuilt engines cost £4,500-£6,500 supply-only.
- Used units start from £2,200 supply-only.
- Rebuilt engines cost £4,500-£6,500 supply-only.
Question 2What are the most common EZ36 engine problems-
The EZ36 suffers from overheating and cooling system failures (its most critical vulnerability), timing chain tensioner wear (100k+ miles), oil leaks from cam carriers and timing covers, and oil starvation under high-G cornering. Cooling system repairs cost £300-£800. Timing chain tensioner replacement costs £400-£800. Cam carrier resealing costs £800-£1,500. The EZ36 has a significantly low head gasket failure rate compared to the EJ25.
- Cooling system repairs cost £300-£800.
- Timing chain tensioner replacement costs £400-£800.
- Cam carrier resealing costs £800-£1,500.
- The EZ36 has a significantly low head gasket failure rate compared to the EJ25.
Question 3Which Subaru models use the EZ36 engine-
The EZ36 was fitted to the Subaru Tribeca (2008-2014), Subaru Legacy 3.6R (2009-2019), and Subaru Outback 3.6R (2009-2019) in the UK. The pre-2014 EZ36 is paired with a 5-speed automatic. The post-2014 EZ36 is paired with a 6-speed CVT.
- The pre-2014 EZ36 is paired with a 5-speed automatic.
- The post-2014 EZ36 is paired with a 6-speed CVT.
Question 4Should I buy a used or reconditioned EZ36-
A reconditioned EZ36 is the safer choice - it includes a new timing chain tensioner, new cooling system components, new cam carrier seals, and a 12-month warranty. Used EZ36s are only recommended with documented cooling system service history. Any EZ36 without cooling system history is a high-risk purchase.
- Used EZ36s are only recommended with documented cooling system service history.
- Any EZ36 without cooling system history is a high-risk purchase.
Question 5What's the difference between EZ36 and EZ30-
The EZ36 is a 3.6-litre engine (vs EZ30's 3.0-litre) with larger bore (92.0mm vs 89.2mm) and longer stroke (91.0mm vs 80.0mm). The EZ36 produces more torque and power (260 hp vs 245 hp) but is more sensitive to cooling system neglect. They share the same basic architecture but are not directly interchangeable.
- They share the same basic architecture but are not directly interchangeable.
Question 6How long does an EZ36 engine last-
With regular maintenance (oil changes every 5k-6k miles using 5W-30, cooling system servicing every 50k miles), an EZ36 can exceed 150,000 miles. Cooling system neglect is the main limit on longevity. Timing chain tensioner may need replacement around 100k-150k miles. The EZ36 is generally robust when properly maintained.
- Cooling system neglect is the main limit on longevity.
- Timing chain tensioner may need replacement around 100k-150k miles.
- The EZ36 is generally robust when properly maintained.
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Get free, no-obligation EZ36 engine quotes tailored to your exact variant and model. Our registration lookup confirms fitment before any quotes are sent, so you only hear from specialists who can actually supply the right unit. With reconditioned EZ36 units from around £3,200, comparing takes two minutes and could save four figures.
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Minimum 12-Month Warranty
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