Buyer's Guide

2021 BMW 8-series
Select a Different Model (9 Available): 840i Convertible
Fuel Economy $ 22 / 29 mpg
Horsepower 335@5,000
Torque 368@1,600
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  • Powerful engines
  • Attractive exterior design
  • Good build quality


  • M8's poorly calibrated brake-by-wire system
  • Nearly useless rear seats in the coupe and convertible
  • Pricier than the 6 Series it essentially replaces

Think of the BMW 8 Series as an attractive grand tourer that's available in three performance levels: quick, quicker, and bonkers. The nameplate returned after a long absence and is one of the most potent models available from BMW. Regardless of whether you choose the coupe, convertible, or the four-door Gran Coupe, you're getting one of the most stylish and eye-catching vehicles on the market.

What's New

  • Lane departure warning is now standard on all models
  • An Anthracite headliner is standard on 840i Coupe and Gran Coupe models
  • M8 models will only be available in Gran Coupe guise for 2021
  • The standalone M8 Competition model has been replaced with a Competition package that contains the same upgrades over the standard M8

What We Think

Drive the 8 Series, and you're guaranteed to get plenty of stares thanks to its svelte profile. The car backs up its looks with blisteringly quick acceleration, especially models powered by the available twin-turbo V-8. Despite having AWD, the 8 Series can be hard to drive enthusiastically; we suspect the 8 Series' rear-wheel steering is causing the lack of predictability when you're pushing the car hard.

Get into the M8, and it's even easier to go sideways thanks to the extra power. Depending on how heavy your right foot is, the M8 can transform into a straight-up tire shredder, especially in RWD mode. At the limit, the M8 grips well as long as you keep power flowing through all four wheels. But the steering lacks feel outside of RWD mode and gets overly heavy. Also, in our testing, the brake-by-wire system didn't work consistently. Drive the M8 a little calmer, and the ride, while taut, is fine for daily driving.

Thanks to excellent fit and finish, the 8 Series' cabin is a nice place to be. If you often travel with friends, opt for the four-door Gran Coupe because the rear seats in the two-door models are very cramped.

Speed and grabbing attention are what the 8 Series specializes in, especially the V-8-powered models. But even if you stick with the standard six-cylinder option, you're still driving one of BMW's quickest and most stylish vehicles.

Performance and Fuel Economy

Every 2021 BMW 8 Series comes with an eight-speed automatic transmission. Although RWD and AWD are available, you can only get the former in the 840i model.

Model: 840i, 840i xDrive
Engine and Transmission: 
3.0-liter turbo I-6 - eight-speed automatic
335 hp/368 lb-ft of torque
EPA-Rated Fuel Economy:
23/30 mpg city/highway (840i Coupe); 22/29 mpg (840i Convertible and Gran Coupe); 20/27 mpg (840i xDrive)

Model: M850i xDrive
Engine and Transmission: 
4.4-liter twin-turbo V-8 - eight-speed automatic
523 hp/553 lb-ft
EPA-Rated Fuel Economy:
17/25 mpg (M850i xDrive Coupe); 17/24 mpg (M850i xDrive Convertible and Gran Coupe)

Model: M8 Gran Coupe
Engine and Transmission: 
4.4-liter V-8
600 hp/553 lb-ft (M8); 617 hp/553 lb-ft (M8 with Competition package)
EPA-Rated Fuel Economy:
15/21 mpg


The 8 Series gets lane departure warning, automatic high beams, forward collision warning, and front automatic emergency braking as standard. The Driving Assistance and Driving Assistance Professional packages include more active safety technologies, including pedestrian detection, traffic jam assist, adaptive cruise control, lane keeping assist, and pedestrian detection.


In the 8 Series, BMW's infotainment system features a 10.3-inch touchscreen, Apple CarPlay, and Android Auto compatibility, a 12.3-inch digital gauge cluster, built-in navigation, and a 464-watt 16-speaker Harman Kardon surround sound system. If that's not enough, upgrade the audio system to a 1,400-watt 16-speaker Bowers & Wilkins Diamond unit.

M8: What Does the Competition Package Add?

Beyond a 17-hp increase, the M8 Competition receives a firmer suspension tune, increased negative camber, and stiffer engine mounts to improve overall handling. The rubber bushings on the standard M8 are also replaced by rear toe-link ball joints to further distinguish the Competition model as the more capable track tool.

Key Competitors:

Engine Name
Engine: 6-Cyl Turbo 3.0 Liter
Transmission Name
Transmission, 8 Speed Automatic with Manual Mode (8HP76 SPORT)
840i Convertible
Premium Performance Car
Standard MPG
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Unleaded Premium
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Amount Description Expiry Date
$4000 BMW announces a Military Program for cash customers. 12-31-2021
$500 BMW announces a Military Program for customers who Lease/OwnersChoice/Retail Finance/Select Finance through BMW Financial Services that is good towards a purchase or lease of select models. 12-31-2021
$0 0.9% Financing available for varying term lengths : 36, 48, 60 Months - BMW announces APR rates on select models. [Regional Incentive. See dealer for availability.] 06-30-2021
$0 1.9% Financing for a maximum term of 72 Months - BMW announces APR rates on select models. [Regional Incentive. See dealer for availability.] 06-30-2021
$1000 BMW announces Lease/APR Credit on select models for eligible College Graduates. 01-03-2022