Symmetrical AWD

What is Symmetrical AWD?

Symmetrical All-Wheel Drive is Subaru’s full-time AWD system, distinguished by the longitudinal arrangement of powertrain components along the vehicle’s centreline. Subaru’s boxer engine — pistons firing horizontally in opposed pairs rather than vertically in a conventional inline or V configuration — sits low in the chassis and along the longitudinal axis. The transmission, transfer case, driveshafts, and rear differential are all arranged symmetrically along that same axis.

The functional consequences of this layout matter for Canadian winter driving. Symmetrical mass distribution along the longitudinal axis produces a lower polar moment of inertia around the vertical axis, which translates to more predictable cornering behaviour. The boxer engine’s low centre of gravity reduces body roll. And the continuous torque distribution to all four wheels — Subaru’s Symmetrical AWD does not “engage” reactively when slip is detected; it operates with permanent torque sent to all four wheels at all times — eliminates the sensor-to-actuator delay that reactive systems produce.

Most Canadian Subarus pair Symmetrical AWD with a Lineartronic CVT and Active Torque Split, which manages front/rear torque distribution through an electronically controlled multi-plate clutch. The WRX manual transmission trims use a viscous-coupling centre differential instead. The BRZ sports coupe is rear-wheel drive only — the only Subaru sold in Canada without Symmetrical AWD.

Why it matters in Canada

Symmetrical AWD is the largest single reason Subaru market share in winter-dominant Canadian provinces — Quebec, Atlantic Canada, Northern Ontario, BC interior — runs roughly double the national average. The continuous engagement architecture matches Canadian winter driving conditions where grip varies unpredictably across the four wheels, and where reactive systems must wait for slip before responding.

The resale-value implication is direct. A 2018 Subaru Outback with verified service history retains roughly $4,000 to $6,000 more than a comparable 2018 reactive-AWD crossover at the same age and kilometres in Canadian Black Book averages. That premium is what Symmetrical AWD compounds in the used market. For Quebec rural buyers and Calgary chinook-zone commuters, the AWD architecture is the product, not a feature.

Common questions

What makes Subaru’s AWD different from other AWD systems?

Subaru’s Symmetrical AWD is continuously engaged — it operates with permanent torque distribution to all four wheels rather than reacting to slip detection. Most competing AWD systems on Toyota, Honda, Nissan, Mazda, and luxury Japanese brands operate primarily as front-wheel drive (or rear-wheel drive on luxury sport sedans) and engage the additional axle through an electronically controlled clutch when sensors detect wheel slip. The engagement happens within milliseconds, but the architecture is fundamentally reactive. Subaru’s system is proactive: torque is already there when you need it, with no sensor delay.

Is Symmetrical AWD always on?

Yes, except on the BRZ sports coupe (which is rear-wheel drive only) and Japan-domestic-market Subaru kei vehicles not sold in Canada. Every Canadian-market Subaru — Outback, Forester, Crosstrek, Impreza, Legacy, Ascent, WRX — has Symmetrical AWD as standard equipment with continuous engagement. There is no driver-controlled AWD switch. The system distributes torque continuously to all four wheels at all times, with electronic torque split adjustment based on driving conditions through the Active Torque Split or viscous-coupling centre differential.

Does the Subaru BRZ have Symmetrical AWD?

No. The Subaru BRZ is a rear-wheel-drive sports coupe co-developed with Toyota (sold as the Toyota GR86). The shared chassis and powertrain emphasize handling balance and lightweight design rather than all-weather capability, which is why both the BRZ and GR86 are rear-wheel drive only. The BRZ is the only Subaru sold in Canada without Symmetrical AWD. For Canadian buyers who want a Subaru sports coupe with AWD, the WRX is the appropriate choice — it retains Symmetrical AWD with a viscous-coupling centre differential on manual transmission trims and the Active Torque Split on automatic trims.