BMW: the driving brand, still — with software as its weakest organ

Published · Researched 2026-09-21

The verdict

Nobody else in the premium business builds a car that steers like a BMW, and nobody else has an engine as trusted as the B58. That covers most of what matters when you're buying used. The bad news: BMW's electronics are now the defining risk on every new car it ships, the 2025 X3's interior is a genuine step backward, and the brand's electric cars depreciate like they're embarrassed. Buy the proven six-cylinder stuff used and skip the first-year experiments, and you get the best-driving cars in the set. Buy new EVs and you're paying to beta-test.

Where BMW wins

Engines and chassis, in that order, every time. The B58 inline-six is the single most trusted powertrain in this research — the praise is boring in the best way: it just works, across the M340i, the X3 M40i/M50, and the X5 40i. Steering feel and balance are the other moat: a G20 against an A4 or a C-Class is less a comparison than a demonstration. The owner communities are the deepest in the business — 52,000 members in the G20 Facebook group, multi-year Bimmerpost threads that double as free owner's manuals — and independents undercut dealers everywhere. Parts are cheap and available globally, and the combustion cars hold their money.

Where BMW loses

Software. Across the iX, the i4, and the new X3, the pattern repeats: hardware shipped finished, code shipped unfinished. The iX's record reads like a bug tracker with wheels — a battery ECU that cut power while driving, cruise control that activated itself when owners turned the wheel, an 83-car batch BMW told owners not to drive, charge, or park indoors. Every one was fixed free. None should have shipped. The i4 is gentler but the same family: software loops, profiles resetting, charging handshake faults. The G45 X3 adds ergonomic self-sabotage: flush door handles owners call terrible, a toggle shifter replacing a lever that worked, iDrive 9 one owner calls "very quirky & often has a mind of its own at times," unconnected AC ducts from the factory, a 192-car recall for badly crimped rear brake hoses on February 2025 builds. The plug-in X5 50e is the most expensive lesson: intermittent drivetrain faults dealers can't reproduce — "test plans inconclusive, no faults found." New BMW EVs depreciate brutally: the iX loses roughly 47% in three years.

The matchups

3 Series vs C-Class vs A4: BMW wins both ways — best to drive, most reliable 3 Series generation ever. The C-Class rides softer but finished last of 23 in the What Car? survey at 76.3%, with a $2–3.5k bell-housing ISG risk. The A4 is the value play: 90.1%, cheaper used, badge now dead — but it never steered like this. Buy the 2023–24 330i/M340i with history; the C-Class only as a 2024–25; the A4 only as a 2021–22 with the Garrett turbo.

i4 vs Model 3 vs Polestar 2: the i4 is the best to drive and the worst to buy new — $57,900–70,700 against a Model 3 Performance at $54,490 with the Supercharger network. The Model 3 is the rational buy if you road-trip: "best daily driver money can't beat on charging network plus software, as long as you get a good build." The Polestar 2 is the i4's shape with more punishment: TCAM outages killing key recognition, 12V gremlins, a winding-down US footprint, $10,000 lease-buyout credits. The i4 answer: a used 2025 eDrive40.

iX vs Model X vs EV9: the iX is the best-riding luxury EV SUV of the three and the only one I'd trust used. The Model X's falcon doors are still failing on 2026 cars — one owner stranded with two toddlers when the doors half-opened and the car refused to drive — with 23 recalls on the 2021s and suspension as the top NHTSA complaint area. The EV9 charges fastest (800V, 350 kW) but brings the angriest dealer stories and ~47% depreciation in two years. A 2024 iX xDrive50 at ~$43k has the recall years behind it and warranty to 2028.

X3 vs GLC vs Q5: two BMWs here, really. The G01 X3 (2017–2024) is the used buy of the decade — mechanically trouble-free, trusted B48/B58 hardware. The G45 (2025+) is the car BMW hopes you'll buy before reading the forums: same engines, everything you touch got worse. The GLC's recall list reads like a hazard manifest — steering-coupling bolts, an 80-amp fuse-box fire campaign, ground-bolt fire risk, a rear-axle diff recall. The new Q5 is lovely to sit in, but 2025 first-year CR scores are below average with one unresolved fueling/misfire complaint. The picks: a 2022–23 G01, a cleared 2025 GLC, a 2026 Q5. Nobody gets the 2025 G45.

X5 vs GLE vs Q7: the X5 40i is the driver's SUV and the B58 is the engine — but the 50e is the fault-diary car, the xDrive shudder survives transfer-case replacement ("within normal parameters" is dealer for "we give up"), and the February 2026 starter-motor fire recall covers 2020–23 cars. The GLE is the comfort king with the best dealer network, undone by 48V bell-housing failures ($2–3.5k) and cylinder-head reports on 350s. The Q7 rides best and seats seven adults properly, then eats brakes and tires like a subscription: $1,200–2,000 brake jobs every 20–35k miles. The fun-and-sound pick: a 2023 X5 40i, last of the pre-facelift.

The support question

BMW's support network is the best in this research — dense dealers, deep independents, forum-level DIY documentation, cheap parts. Where it breaks is the diagnostic gap: intermittent high-voltage and software faults on the 50e and iX that dealers can't reproduce, ending in "no faults found" and towed cars returned with a shrug. BMW's OTA program beats VW Group's but stays inconsistent, and iX charging-fault owners have been told to blame their own chargers. The 2025 G45 adds a wrinkle: dealers puzzled by first-year issues before the TSBs existed. Warranty is standard (4 yr/50k US), 8 yr/100k on EV batteries. Excellent for anything mechanical, uneven for anything digital — exactly backwards from where the industry is heading.

Who should buy / who should skip

Buy a BMW if you care how a car steers and you're buying the proven stuff: a 2023–24 G20, a used i4, a used iX, a G01 X3, a 2023 X5 40i. You get the best-driving car in every segment and a community that will talk you through any repair. Skip BMW if you want Japanese maintenance bills, if you buy first-year cars — 2022 i4, 2025 G45, 2024 50e, 2022 iX; the forums keep a list and it keeps being right — or if your idea of a good time is a dealer explaining why the computer can't find the fault your car definitely has. Never buy a new iX. Never buy a tuned M340i — the guides call it reliability roulette and they mean it.

The bottom line

BMW builds the best-driving cars in the business and ships the least-finished software — buy the six-cylinder stuff used, skip everything first-year, and let someone else fund your depreciation.