As a product of BMW’s M division, this musclebound 5 Series packs some serious powertrain specs. Beneath its hood lives a 4.4-litre twin turbo V8 producing 577 horsepower and 533 pound-feet of torque. Additionally, attached to the M5’s eight-speed automatic transmission is an electric motor that receives power from a 14.8-kilowatt-hour battery pack, which pitches in 194 hp and 207 lb-ft. That brings peak power to an astonishing 717 hp and 738 lb-ft of torque at 5,600 and 1,800 rpm, respectively. A standard xDrive all-wheel drive (AWD) system manages that tremendous power.
Curb weight may come in at a hefty 2,445 kilograms (5,390 pounds), but the M5 is still blindingly quick: 0 to 100 km/h takes 3.5 seconds according to BMW, and triple-digit speeds arrive awfully soon after. Battery-sourced torque is easy to discern from what’s coming from the V8’s crankshaft, but we’re not complaining. This latest M5 is a riot to launch off the line or to merge onto the highway. Top speed is electronically limited to 250 km/h in the base configuration, but the limit can be raised to 305 km/h with the optional M Driver’s Package ($2,500).
Also impressive considering its weight is how well this rotund M car carves through a winding mountain road. Rear-wheel steering, combined with trick differentials, adaptive dampers, and sporty suspension tuning give the M5 a surprising amount of agility with great steering response and barely any body roll under hard cornering. Overall feel was lacking, though, especially in the front end while ripping along at speed.
Yet, despite this strong propensity for lateral and longitudinal g-force thrills, we were disappointed in the soundtrack, which was overall way too quiet. Whether intake- or exhaust-sourced (the latter having two settings), we could barely hear the engine at wide-open throttle, or even in town, when the noise should have been bouncing off walls and parked cars. There ought to be a clear distinction in decibels between the two modes: not “quiet” and “ever-so-slightly-less quiet.”
For in-town everyday driving, our tester rode generally well with its dampers set to Comfort. But even that mode leaned a bit too far towards enthusiastic when the road surface got rough, causing the suspension to exhibit some choppiness and even faint clunking. This further emphasized the overly quiet soundtrack. If an enthusiast-geared sports sedan possesses a ride quality that errs on the side of performance, it should have a raucous sound to complete the overall package.
As the M5 is now a plug-in hybrid (PHEV), we spent plenty of time tooling around in electric-only mode, which can be used for up to 43 kilometres at a time, with decent acceleration for around-town driving. Since the electric motor interfaces with the gearbox, its power is sent through the conventional drivetrain. Power delivery and shifts were smooth, though they got a tad jerky at full throttle.
As in many PHEVs, there’s a notch in the accelerator pedal that fires up the gasoline engine if you push past it, sort of like the kick-down switch in non-hybrid cars with automatic transmissions. If you do that regularly, though, you’ll be living with high fuel consumption. We saw around 20 L/100 km during our time with the M5, well above Natural Resources Canada’s estimate of 17.3 L/100 km in combined driving while in hybrid mode.