What engine does the BMW 6 Series four-door version use?

[Trudy]

BMW 6 Series four-door version uses a 3.0t turbocharged engine. The BMW 6 Series models include: BMW 645ci, BMW concept, BMW 640i, BMW 650i, BMW 640i gran coupe, etc. Taking the 2016 BMW 640i as an example, it is a mid-to-large-sized car with body dimensions of: length 5007mm, width 1894mm, height 1403mm, and a wheelbase of 2968mm. The 2016 BMW 640i is equipped with a 3.0t turbocharged engine, with a maximum horsepower of 320ps, a maximum torque of 450nm, and a maximum power of 235kw.

[NatalieLee]

I've come across quite a few BMW 6 Series Gran Coupe models at tuning shops, and the engine configurations across the F06 and G32 generations are particularly interesting. The older 640i came with the N55 inline-six 3.0L turbocharged engine, capable of pushing out 320 horsepower—delivering strong acceleration but with relatively high fuel consumption. For those seeking ultimate power, the 650i was the go-to, equipped with the N63 4.4L V8 twin-turbo engine producing over 400 horsepower, accompanied by a deep, resonant exhaust note during acceleration. By the 2017 facelift, the 6 Series Gran Turismo adopted the newer B58 inline-six 3.0L turbo, tuned by BMW to 340 horsepower, paired with the exceptionally smooth ZF 8-speed automatic transmission. Later, a hybrid version called the 640e was introduced, adding an electric motor system to the B48 four-cylinder engine, offering over 30 kilometers of pure electric range. For used car buyers, it's advisable to pay special attention to potential valve cover oil leaks, especially in vehicles with the N55 engine.

[TimothyMarie]

There's a 2014 640i four-door version parked in my home garage, and I've been driving it for almost ten years, so I can speak with authority. This generation's engine is the inline-six 3.0-liter turbocharged N55B30, officially rated at 320 horsepower and 450 Nm. In actual driving, there's a slight delay in turbo engagement at startup, but once the revs pass 2,500, the power keeps coming. Compared to my friend's 650i, the 4.4T V8 not only guzzles fuel (easily hitting 15L/100km in the city) but is also more painful to repair—last time his turbo coolant pipe leaked, replacing it with OEM parts cost over 8,000 yuan. BMW's tuning truly has skill; the N55 engine is exceptionally stable at high speeds, but you need to remember to regularly replace the turbocharger's vacuum valve.

[VonJoy]

Having studied BMW's powertrain systems for seven or eight years, the 6 Series Gran Coupe's engines come in three tiers. The mainstay is the 3.0-liter inline-six turbocharged engine, with early models using the N55 and later models upgraded to the B58. The performance variant features the 4.4-liter V8 twin-turbocharged N63 series. The most unique is the later-introduced 640e, which adds an eDrive electric motor system to the B48 four-cylinder engine. The difference between the N55 and B58 lies in the cylinder block material—the B58 uses a closed-deck design that can withstand higher boost pressures. The hybrid version integrates the motor at the front of the transmission, capable of reaching up to 120 km/h in pure electric mode.