The Subaru EZ36D is a 3,649 cc, flat — six petrol engine produced between 2007 and 2019. It features a DOHC 24 — valve configuration with multi — point fuel injection (MPFI) and delivers 191 kW (260 PS) in standard applications. Developed as the largest naturally aspirated engine in Subaru's lineup, it was engineered for smooth power delivery, refined operation, and balanced weight distribution in premium all — wheel — drive platforms.
Fitted to models such as the Outback 3.…
Subaru
Production years 2007–2019 meet U.S. EPA Tier 2 Bin 5 standards; Canadian and European variants comply with equivalent national regulations .
The Subaru EZ36D is a 3,649 cc flat-six naturally aspirated engine engineered for mid-size and large applications (2007–2019). It combines Subaru's horizontally-opposed layout with MPFI to deliver smooth, vibration-free power delivery and mechanical refinement. Designed to meet Tier 2 Bin 5 emissions, it balances performance with longevity in diverse operating conditions.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,649 cc | |
Fuel type | Petrol | |
Configuration | Flat-6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 92.0 mm × 91.0 mm | |
Power output | 191 kW (260 PS) @ 6,000 rpm | |
Torque | 350 Nm @ 4,400 rpm | |
Fuel system | Multi-point fuel injection (MPFI) | |
Emissions standard | U.S. EPA Tier 2 Bin 5 | |
Compression ratio | 10.4:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven (front-mounted, dual chains) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 182 kg |
The Subaru EZ36D was used across Subaru's Outback and Legacy platforms with longitudinal mounting and symmetrical all-wheel drive. This engine received platform-specific adaptations-reinforced transmission mounts in the Outback 3.6R and revised intake manifolds in the Legacy 3.6R-and from 2010 the updated Outback BL/BP Facelift models adopted improved timing chain guides and oil squirters, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The EZ36D is a robust, low-stress engine when maintained properly. Regular oil changes (every 10,000 km) and coolant flushes (every 2 years) are essential. Engines with documented service history and no overheating incidents can exceed 300,000 km reliably. Its DOHC design and conservative tuning contribute to long-term durability in daily driving applications.
The most common issues include timing chain guide wear, ignition coil failure, throttle body carbon buildup, and valve cover oil leaks. These are documented in Subaru service literature and prevalent in high-mileage or poorly maintained examples. Preventative maintenance significantly reduces failure risk.
The EZ36D was used in the Subaru Outback (BL/BP, 2007-2019) and Legacy (BM/BT, 2007-2014). It was reserved for top-tier trim levels in North American and Japanese markets. The engine was phased out in favor of the FA24 turbocharged four-cylinder in later model years.
Aftermarket ECU tuning is common on the EZ36D platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel consumption is moderate for its era. In the Outback 3.6R, combined consumption is approximately 12.4 L/100km (~23 mpg UK). City driving may exceed 15.2 L/100km (~19 mpg), while highway cruising can achieve ~9.8 L/100km (~29 mpg). Driving style significantly impacts real-world economy.
Yes. The EZ36D is an interference engine. If the timing chain fails or skips, the pistons will contact the valves, resulting in severe internal damage. The front-mounted dual-chain system is durable but must be inspected regularly, especially in high-heat climates.
Subaru specifies SAE 5W-30 oil meeting API SM standards. This viscosity is essential for lifter quietness and camshaft protection. Oil must be changed every 10,000 km or annually, and OEM-approved filters should be used to ensure proper flow and filtration.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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