The Subaru Legacy IV 3.0i spec.B, produced from 2005 to 2006, represented the pinnacle of performance for the fourth-generation Legacy (BE/BH chassis). Positioned as the flagship trim, the spec.B combined a potent 3.0-liter naturally aspirated boxer engine with a five-speed automatic transmission and Subaru’s symmetrical all-wheel-drive system. This variant was primarily aimed at enthusiasts seeking a blend of comfort, practicality, and engaging driving dynamics, differentiating itself from the more economy-focused base models. It was sold primarily in markets like Japan, Australia, and to a lesser extent, North America.
Technical Specifications
| Brand | Subaru |
| Model | Legacy |
| Generation | Legacy IV |
| Type | 3.0i spec.B (245 Hp) AWD Automatic |
| Start of production | 2005 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 13.9 l/100 km (16.9 US mpg, 20.3 UK mpg, 7.2 km/l) |
| Fuel consumption (extra urban) | 7.3 l/100 km (32.2 US mpg, 38.7 UK mpg, 13.7 km/l) |
| Fuel consumption (combined) | 9.7 l/100 km (24.2 US mpg, 29.1 UK mpg, 10.3 km/l) |
| CO2 emissions | 229 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.2 sec |
| Acceleration 0 – 62 mph | 8.2 sec |
| Acceleration 0 – 60 mph | 7.8 sec |
| Maximum speed | 237 km/h (147.26 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 6.5 kg/Hp, 153.6 Hp/tonne |
| Weight-to-torque ratio | 5.4 kg/Nm, 186.2 Nm/tonne |
| Power | 245 Hp @ 6600 rpm |
| Torque | 297 Nm @ 4200 rpm (219.06 lb.-ft. @ 4200 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | EZ30D |
| Engine displacement | 2999 cm3 (183.01 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Boxer |
| Cylinder Bore | 89.2 mm (3.51 in.) |
| Piston Stroke | 80 mm (3.15 in.) |
| Compression ratio | 10.7:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 5.3 l (5.6 US qt | 4.66 UK qt) |
| Coolant capacity | 7.9 l (8.35 US qt | 6.95 UK qt) |
| Kerb Weight | 1595 kg (3516.37 lbs.) |
| Max. weight | 2030 kg (4475.38 lbs.) |
| Max load | 435 kg (959.01 lbs.) |
| Trunk (boot) space (minimum) | 433 l (15.29 cu. ft.) |
| Fuel tank capacity | 64 l (16.91 US gal | 14.08 UK gal) |
| Max. roof load | 80 kg (176.37 lbs.) |
| Permitted trailer load (with brakes) | 2000 kg (4409.25 lbs.) |
| Permitted trailer load (without brakes) | 750 kg (1653.47 lbs.) |
| Length | 4665 mm (183.66 in.) |
| Width | 1730 mm (68.11 in.) |
| Height | 1425 mm (56.1 in.) |
| Wheelbase | 2670 mm (105.12 in.) |
| Front track | 1495 mm (58.86 in.) |
| Rear track | 1490 mm (58.66 in.) |
| Ride height (ground clearance) | 155 mm (6.1 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 5 |
| Gearbox type | Automatic transmission |
| Front suspension | Spring Strut |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 215/45 R18ZR |
| Wheel rims size | 18 |
Powertrain & Engine Architecture
The heart of the 3.0i spec.B is the EZ30D engine, a 3.0-liter (2999 cc) naturally aspirated boxer-six. This engine, a hallmark of Subaru’s engineering, features a horizontally opposed configuration, which contributes to a low center of gravity and improved balance. The EZ30D utilizes a single overhead camshaft (SOHC) per cylinder bank, operating 24 valves (four per cylinder). Fuel delivery is managed by a multi-point fuel injection system. The engine produces 245 horsepower at 6,600 rpm and 297 Nm (219 lb-ft) of torque at 4,200 rpm. The five-speed automatic transmission, while providing convenience, was sometimes criticized for not being as responsive as the available manual transmission. It was designed to handle the engine’s output and deliver power effectively to all four wheels through Subaru’s symmetrical all-wheel-drive system.
Driving Characteristics
The 3.0i spec.B offered a refined driving experience. While not as overtly sporty as some of its competitors, the combination of the smooth boxer engine, the automatic transmission, and the all-wheel-drive system provided confident handling and traction in various conditions. The automatic transmission, while not offering the direct control of a manual, was programmed for relatively quick shifts. Acceleration from 0-60 mph took around 7.8 seconds, and the car had a top speed of 147 mph. Compared to the 2.5-liter naturally aspirated models, the 3.0i spec.B offered significantly more power and torque, resulting in more effortless acceleration and passing maneuvers. However, the higher output came at the cost of increased fuel consumption.
Equipment & Trim Levels
The “spec.B” designation signified a higher level of equipment. Standard features typically included leather upholstery, power-adjustable front seats, a premium audio system, automatic climate control, and alloy wheels. The spec.B also often featured unique exterior styling cues, such as a different grille and rear spoiler. Optional extras could include a sunroof, navigation system, and upgraded sound system. The interior was generally well-appointed, focusing on comfort and functionality.
Chassis & Braking
The Legacy IV utilized a MacPherson strut front suspension and a double-wishbone rear suspension. The spec.B often featured stiffer springs and dampers compared to lower trims, enhancing handling and reducing body roll. Braking duties were handled by ventilated discs at the front and solid discs at the rear, equipped with an anti-lock braking system (ABS). The all-wheel-drive system provided excellent traction, particularly in inclement weather. The car’s weight of approximately 3516 lbs was relatively high, but the AWD system helped to mitigate the effects of this weight during cornering.
Market Reception & Comparison
The 3.0i spec.B was generally well-received by automotive critics, who praised its smooth engine, comfortable ride, and all-weather capability. However, some reviewers noted that the automatic transmission could feel somewhat sluggish compared to the manual option. Fuel economy was also a point of concern, with combined fuel consumption averaging around 24.2 US mpg. Compared to other trims in the Legacy lineup, the 3.0i spec.B offered a significant performance upgrade but came with a higher price tag and increased running costs. Competitors included the Acura TL, Audi A4, and BMW 3 Series, all of which offered similar levels of performance and luxury.
Legacy
The EZ30D engine, while robust, is known to require regular maintenance, particularly regarding oil changes. The timing belt requires replacement at specified intervals to prevent catastrophic engine failure. The automatic transmission, while generally reliable, can experience issues with solenoid failure over time. Today, the Subaru Legacy IV 3.0i spec.B is considered a desirable used car, particularly among Subaru enthusiasts. Well-maintained examples command a premium price due to their performance, rarity, and the enduring appeal of the boxer engine and all-wheel-drive system. Its blend of practicality, performance, and all-weather capability continues to make it a compelling option for those seeking a unique and capable sedan.
