BMW 840i vs 840d: Key Differences in Performance and Luxury
When choosing between the BMW 840i and 840d, buyers face a compelling balance of power, comfort, and technology—two variants that redefine the executive sedan segment. The 840i, powered by a refined 3.0-liter inline-six, delivers 523 horsepower with seamless responsiveness, setting a benchmark for smooth, dynamic driving. Its twin-scroll turbocharging ensures quick revs and efficient performance, while the 840d takes a different path with a turbocharged 3.0-liter V6, producing 523 horsepower as well but emphasizing balanced power delivery and a slightly higher torque curve.
The 840i leans into BMW’s hallmark driving precision—steering feels agile, suspension is tuned for sporty handling, and interior materials blend premium quality with understated elegance. In contrast, the 840d offers a more spacious cabin with enhanced comfort features, including adaptive air suspension options and refined acoustic insulation, making long drives exceptionally quiet. Despite sharing engineering roots, the 840d’s focus on refinement appeals to those prioritizing luxury over pure sportiness.
Ultimately, the 840i excels for driving enthusiasts craving immediacy and agility, while the 840d satisfies luxury seekers who value comfort and cutting-edge tech without sacrificing performance. Both deliver BMW’s signature refinement—select based on whether you prioritize passion or poise.
Choose the 840i for dynamic precision, or the 840d for elevated luxury—both represent the pinnacle of BMW’s executive sedan excellence.
BMW M8 Forum and 8 Series Forum BMW M8 and 8-Series General Discussion Review: Why I went with 840d & not 840i or M850i, after driving all 3 [incl updates] Thread Tools Bookmarks twitter Facebook Digg Google StumbleUpon del.icio.us My Yahoo! 8 series is not selling. The coupe is the best looking BMW right now imo.
840i is definitely more reliable than m850i. Actually the power train on 840i would be bullet proof. Read our 2026 BMW 8-Series review for information on ratings, pricing, specs, and features, and see how this convertible performed in our testing.
The Specifications Under the hood, the 2025 BMW 8 Series offers distinct powertrains across its trim levels, showcasing BMW's commitment to performance. The 840i and 840i xDrive both feature a 3.0L inline. 840i vs 850i Kaufberatung - mal wieder?! 62 BMW 6er, 7er, 8er Forum M850ix GC oder 840i GC Kaufberatung 82 BMW 6er, 7er, 8er Forum 440i vs 840i - Kosten / Unterhalt 16 BMW 6er, 7er, 8er Forum Volv21.
The 2025 BMW 8 Series has five different trim levels: 840i, 840i xDrive, M850i xDrive, M8 Competition, and ALPINA B8. All BMW 8 Series models are available as a 4. I looked at the 435i/440i vs 640d/i which is the spiritual predecessor of the 8 series.
I plumped for a 4 series primarily because of usability. The 6/8 series are, without doubt, the better car. The 840i petrol model manages up to 33.6mpg with CO2 emissions of 190g/km, while if you want to track down a used 840d diesel version then you'll benefit from fuel economy of around 44mpg.
The 840i petrol is the only version of the 8 Series that comes with rear-wheel drive, but it's the 840d xDrive, the four-wheel-drive car with a diesel under the bonnet, that really impresses on. Read the definitive BMW 8 Series 2026 review from the expert What Car? team. Check specs, prices, performance and compare with similar cars.