Used BMW 8 Series: Your Complete Buying Guide
The BMW 8 Series is the kind of car that turns heads at traffic lights and makes you look for excuses to take the long route home. Originally launched in the 1990s, this luxury grand tourer disappeared for nearly two decades before making a triumphant comeback in 2018. The modern 8 Series combines stunning design with cutting-edge technology and genuine performance credentials, whether you opt for a coupe, convertible, or the more practical Gran Coupé.
If you're considering a used BMW 8 Series, you're looking at one of the most striking ways to travel in serious style without the eye-watering depreciation of buying new. This guide will walk you through everything you need to know about finding the right 8 Series for you, from understanding the different trims and generations to spotting potential issues and getting the best value for your money.
Why Buy a Used BMW 8 Series?
There's something special about sliding into the driver's seat of an 8 Series. It's not just transport; it's a statement about appreciating the finer things whilst still wanting something that can properly shift when the mood takes you. The cabin feels like a luxury lounge, with materials and build quality that rival anything from Bentley or Aston Martin, yet it comes with the practicality and everyday usability that German engineering does so well.
Buying used makes particular sense with the 8 Series. These cars depreciate significantly in their first few years, which means you can pick up a nearly-new example for considerably less than the original price. You'll still get a car that feels special every time you use it, but without the financial hit that comes with being the first owner. Many used examples come loaded with specification too, as original buyers tended to tick plenty of boxes on the options list.
The 8 Series also offers surprising versatility. The Gran Coupé gives you four proper doors and reasonable rear space, making it a genuine alternative to a BMW 3 Series or even a 5 Series if you want something more dramatic. Meanwhile, the convertible offers open-air motoring without compromising on refinement or performance.
BMW 8 Series Overview
The current-generation 8 Series (G14/G15/G16, depending on body style) represents BMW's return to the luxury grand tourer segment after a long absence. Built on the same platform as the 7 Series saloon, it shares much of that car's technology and sophistication but wraps it in a far more exciting package.
Under the bonnet, you'll find a range of powerful engines. The 840i uses a 3.0-litre straight-six petrol producing around 335bhp, whilst the 840d offers a 3.0-litre diesel with similar power but considerably more torque and better fuel economy. At the top of the range sits the M850i, with a 4.4-litre V8 delivering 523bhp and performance that'll embarrass many supercars. There's also the full-fat M8 and M8 Competition models, which push power up to 625bhp for those who simply must have the most potent option.
All versions come with xDrive all-wheel drive as standard, ensuring you can use that performance in all weather conditions. The eight-speed automatic gearbox is smooth in everyday driving but can swap cogs with impressive speed when you're pressing on. Standard equipment is generous, with features like adaptive LED headlights, heated leather seats, and BMW's latest iDrive infotainment system.
Generations and Body Styles
G14 Coupé (2018–present)
The two-door coupé launched first and remains the purest expression of the 8 Series concept. With its long bonnet, sweeping roofline, and muscular haunches, it's arguably the best-looking BMW of recent years. The coupé seats four, though rear passengers need to be understanding about headroom and legroom. Boot space is decent at 420 litres, making it genuinely practical for weekend trips.
Pros include the stunning looks, involving driving dynamics, and that special feeling you get from a proper two-door coupé. The main downside is limited rear space and the relatively high running costs, particularly with the V8 models.
G15 Convertible (2019–present)
BMW added the convertible variant in 2019, featuring a fabric soft-top that opens or closes in 15 seconds at speeds up to 31mph. The roof mechanism is beautifully engineered and doesn't compromise boot space too dramatically when it's folded. Wind buffeting is well controlled even with the roof down, and the car feels just as solid as the coupé.
The convertible is perfect if you prioritise open-air driving and live somewhere with decent weather. It's slightly heavier than the coupé, which dulls the handling by a fraction, but you'd need to be driving very enthusiastically to notice. The main consideration is the premium you'll pay over an equivalent coupé, both for the initial purchase and the potential future costs of maintaining the roof mechanism.
G16 Gran Coupé (2019–present)
If you need more practicality, the four-door Gran Coupé is your answer. It adds around 200mm to the wheelbase, transforming rear seat space from tight to genuinely usable for adults. Boot capacity increases to 440 litres, and you get proper door openings rather than asking passengers to clamber through narrow gaps.
The Gran Coupé makes sense if you're considering the 8 Series as your only car or frequently carry passengers. It retains much of the coupé's visual drama whilst offering significantly better everyday usability. Some purists argue it dilutes the 8 Series concept, but for most buyers, the extra practicality is worth the marginal aesthetic compromise.
Trim Levels and Specifications
840i and 840d
These entry-level models (if you can call a £75,000 car entry-level) use six-cylinder engines and represent the sweet spot for many buyers. The 840i's petrol engine is smooth and responsive, whilst the 840d diesel offers better fuel economy and impressive mid-range punch. Both produce around 335bhp, which is more than adequate for swift progress.
Standard specification includes leather upholstery, adaptive suspension, wireless phone charging, and a comprehensive suite of driver assistance systems. You'll typically find that used examples have been optioned with extras like the Harman Kardon sound system, head-up display, and various interior trim upgrades.
M850i
Step up to the M850i, and you get BMW's twin-turbo V8 producing 523bhp. Performance is genuinely exhilarating, with 0-60mph taking around 3.7 seconds. The V8 also brings a more theatrical soundtrack and a feeling of effortless power delivery that the six-cylinder models can't quite match.
The M850i includes M Sport styling, larger wheels, upgraded brakes, and various chassis tweaks. Interior materials take a step up, with extended leather and carbon fibre trim. Running costs are notably higher though, with fuel economy in the mid-twenties at best and insurance premiums to match.
M8 and M8 Competition
The full M Division treatment adds another 100bhp and transforms the 8 Series into a genuine supercar rival. The M8 Competition produces 625bhp and will reach 62mph in just 3.2 seconds. It also gets uprated suspension, more aggressive bodywork, and a cabin full of Alcantara and carbon fibre.
These models are relatively rare on the used market and command premium prices. They're also expensive to run and maintain, with servicing costs and tyre wear requiring deep pockets. However, if you want the ultimate 8 Series experience and have the budget, the M8 Competition is a genuinely special machine.
What to Look for When Buying
Service History
A comprehensive BMW service history is essential, particularly with the V8 models. Check that all scheduled maintenance has been completed on time and that any warranty work has been properly documented. The 8 Series uses condition-based servicing, so intervals vary depending on how the car has been driven.
Known Issues
Early G-series cars occasionally suffered from software glitches affecting the infotainment system and parking sensors. These should have been addressed through software updates, but worth checking everything functions properly during your test drive. The exhaust particulate filters on diesel models can cause problems if the car has mainly been used for short journeys.
Specification and Options
Original list prices varied enormously depending on options fitted. Desirable extras include the Harman Kardon or Bowers & Wilkins sound systems, glass controls for the iDrive, laser headlights, and comfort seats with massage function. Check exactly what's fitted to ensure you're not paying M850i money for a lightly-specified 840i.
Test Drive Tips
Pay attention to how the eight-speed gearbox behaves, particularly in stop-start traffic. It should be smooth and unobtrusive. Check the adaptive suspension cycles through its modes properly and that there are no unusual noises from the steering or suspension. Make sure all the driving assistance systems work correctly, as issues here can be expensive to fix.
Inspection Points
Examine the large alloy wheels carefully for kerb damage, as refurbishment is costly. Check tyre tread depth and condition—premium performance tyres don't come cheap on the 8 Series. Look for any paint inconsistencies that might indicate accident repairs, and check panel gaps are even. Inside, scrutinise the leather for any wear, though it's generally very hard-wearing.
Frequently Asked Questions
Is the BMW 8 Series a good car to buy used?
Absolutely. The 8 Series represents exceptional value as a used purchase because it depreciates heavily in its first few years. You can enjoy a car that competed with £100,000+ rivals when new for a fraction of that price. Just ensure you budget appropriately for running costs, as maintenance, insurance, and tyres remain expensive regardless of purchase price.
What are the differences between the 840i, 840d, and M850i?
The main distinction is power and refinement. The 840i uses a 3.0-litre petrol six-cylinder with 335bhp, whilst the 840d has a 3.0-litre diesel producing similar power but more torque and better economy. The M850i jumps to a 4.4-litre V8 with 523bhp, bringing dramatically faster performance and a more engaging soundtrack, though at the cost of higher running expenses.
What body styles does the BMW 8 Series come in?
You can choose between the two-door coupé, the soft-top convertible, or the four-door Gran Coupé. The coupé is the purest driver's car, the convertible adds open-air theatre, and the Gran Coupé provides genuine rear seat space and practicality. All three share the same fundamental character, so your choice depends mainly on how you'll use the car.
How much does a used BMW 8 Series cost in the UK?
Prices start around £40,000 for early 840i models with higher mileage, whilst low-mileage M850i examples can still command £70,000 or more. The Gran Coupé typically trades at a small premium over equivalent coupés due to its added practicality. Browse used BMW 8 Series for sale to see current market values and available stock.
What should I check before buying a used 8 Series?
Verify the service history is complete with main dealer stamps where possible. Check the specification carefully, as original prices varied wildly depending on options. Test all electrical systems thoroughly, paying particular attention to the infotainment and driver assistance features. Examine the expensive alloy wheels for damage and ensure tyres have plenty of tread remaining. Consider having an independent inspection if you're spending serious money.
That depends on what you prioritise. The M8 is noticeably faster and more focused, with sharper responses and more aggressive styling. However, the M850i is still extremely quick and arguably more comfortable for long-distance cruising. Unless you regularly use the car on track or simply must have the most extreme version, the M850i represents better value and lower running costs.
How reliable is the BMW 8 Series?
The 8 Series is built to high standards and should prove reasonably reliable provided it's properly maintained. The six-cylinder engines have proven themselves across BMW's range, whilst the V8 is shared with the Mercedes-Benz models under BMW's collaboration agreement. Software issues affected some early cars, but these were largely resolved through updates. Stick to BMW's service schedule and address any warning lights promptly.
What's the fuel economy of the BMW 8 Series?
Expect around 32-38mpg from the 840d diesel in mixed driving, making it the most economical option. The 840i petrol returns approximately 28-34mpg depending on how you drive it. The M850i V8 manages 23-28mpg at best, whilst the M8 Competition struggles to exceed 25mpg even when driven gently. All models require premium fuel.
Are there any common issues with the BMW 8 Series?
Early cars occasionally suffered from software glitches affecting various systems, though updates have largely addressed these. The diesel models' particulate filters can cause problems if the car has mainly covered short journeys. Some owners report the brake discs wear relatively quickly, particularly on the heavier V8 models. Check for any outstanding recalls or service campaigns when viewing a particular car.
How does the BMW 8 Series compare to the 7 Series or S-Class Coupé?
The 8 Series is more focused on driving enjoyment than the 7 Series saloon, with sharper handling and more dramatic styling. Compared to the Mercedes S-Class Coupé, the BMW feels more athletic and engaging, whilst the Mercedes prioritises refinement and luxury. If you want something that's genuinely exciting to drive rather than just wafting along in comfort, the 8 Series is the pick.
