The Lemon Index
BMW's 3.0 L single twin-scroll turbo inline-6 in the 2 Series, 3 Series, 4 Series, 5 Series, 7 Series, X3, X4, X5, X6, X7, Z4, model years 2016–2026. YouTube likes the 2023 best.
Liked, but check the recalls: YouTube owner tone 59/100, #9 of 165 engines with a YouTube study (in the top third); 2 engine-related recalls on record, 5 known issues listed below. Compare it with the FA24, EA888, Coyote and B58 →
Reliability by year
YouTube videos are most positive about the 2023 (62) and least about the 2016 (52); neighboring years share many of the same videos, so small gaps mean little.
Owner score = the whole car's Lemon Index where this was its only engine that year; a gray dot means the model shared engines, so the number isn't this engine's alone. How we count
How each number is matched to the engine: (a) complaints filed under a version name that used only this engine that year (e.g. "335I"); (b) the model had only this engine that year, so its Lemon Index (complaints per car sold vs the average car) applies to every car with this engine; "all engines combined" = the model had several engines under one name, so its number is not this engine's alone. Owner complaints cover the whole car (brakes, air bags, electrics ...), not only the engine. None of these is a failure rate. YouTube tone = how positive the videos are, 0–100, from titles and transcripts that name the engine or a version that used it. A video whose title names no model year counts toward every year of its generation, so neighboring years share most of their videos.
All the numbers, year by year
| Year | Cars with it | Owner complaints | Complaints naming "B58" | YouTube says | Top complaint areas |
|---|---|---|---|---|---|
| 2016 | BMW 3 Series 340i, 340i xDrive BMW 7 Series 740i | 19 complaints (a: filed as 340i, 740i) | 1 | 52 (25 videos, 13 naming 2016) | electrical, engine, other |
| 2017 | BMW 3 Series 340i, 340i xDrive BMW 5 Series 540i, 540i xDrive BMW 7 Series 740i, 740i xDrive BMW 4 Series 440i, 440i xDrive BMW 2 Series M240i, M240i xDrive | 40 complaints (a: filed as 340i, 540i, 740i, 440i, M240i) | 2 | 56 (50 videos, 26 naming 2017) | electrical, engine, air bags |
| 2018 | BMW 3 Series 340i, 340i xDrive BMW 5 Series 540i, 540i xDrive BMW 7 Series 740i, 740i xDrive BMW X3 X3 M40i BMW 4 Series 440i, 440i xDrive BMW 2 Series M240i, M240i xDrive | 49 complaints (a: filed as 340i, 540i, 740i, 440i, M240i) | 1 | 56 (55 videos, 30 naming 2018) | air bags, seat belts, seats |
| 2019 | BMW 3 Series 340i xDrive BMW 5 Series 540i, 540i xDrive BMW 7 Series 740i, 740i xDrive BMW X5 X5 xDrive40i BMW X3 X3 M40i BMW 4 Series 440i, 440i xDrive BMW 2 Series M240i, M240i M Performance, M240i xDrive, M240i xDrive M Performance BMW X4 X4 M40i BMW X7 X7 xDrive40i | 19 complaints (a: filed as 540i, 740i, 440i) | 15 | 59 (58 videos, 39 naming 2019) | engine, other, electrical |
| 2020 | BMW 3 Series M340i, M340i xDrive BMW 5 Series 540i, 540i xDrive BMW 7 Series 740i, 740i xDrive, 745e xDrive BMW X5 X5 sDrive40i, X5 xDrive40i BMW Z4 Z4 M40i BMW X3 X3 M40i BMW X6 X6 sDrive40i, X6 xDrive40i BMW 4 Series 440i, 440i xDrive BMW 2 Series M240i, M240i M Performance, M240i xDrive, M240i xDrive M Performance BMW X4 X4 M40i BMW X7 X7 xDrive40i | 57 complaints (a: filed as M340i, 540i, 740i) | 24 | 58 (47 videos, 23 naming 2020) | engine, other, electrical |
| 2021 | BMW 3 Series M340i, M340i xDrive BMW 5 Series 540i, 540i xDrive BMW 7 Series 740i, 740i xDrive, 745e xDrive BMW X5 X5 sDrive40i, X5 xDrive40i, X5 xDrive45e BMW Z4 Z4 M40i BMW X3 X3 M40i BMW X6 X6 sDrive40i, X6 xDrive40i BMW 4 Series M440i, M440i xDrive BMW 2 Series M240i, M240i xDrive BMW X4 X4 M40i BMW X7 X7 xDrive40i | 27 complaints (a: filed as M340i, 540i, 740i, M440i) | 11 | 59 (82 videos, 62 naming 2021) | engine, transmission & drivetrain, brakes |
| 2022 | BMW 3 Series M340i, M340i xDrive BMW 5 Series 540i, 540i xDrive BMW 7 Series 740i, 740i xDrive, 745e xDrive BMW X5 X5 sDrive40i, X5 xDrive40i, X5 xDrive45e BMW Z4 Z4 M40i BMW X3 X3 M40i BMW X6 X6 xDrive40i BMW 4 Series M440i, M440i xDrive BMW 2 Series M240i xDrive BMW X4 X4 M40i BMW X7 X7 xDrive40i | 21 complaints (a: filed as M340i, 540i, 740i, M240i) | 0 | 59 (117 videos, 80 naming 2022) | transmission & drivetrain, electrical, steering |
| 2023 | BMW 3 Series M340i, M340i xDrive BMW 5 Series 540i, 540i xDrive BMW 7 Series 740i BMW X5 X5 sDrive40i, X5 xDrive40i, X5 xDrive45e BMW Z4 Z4 M40i BMW X3 X3 M40i BMW X6 X6 xDrive40i BMW 4 Series M440i, M440i xDrive BMW 2 Series M240i, M240i xDrive BMW X4 X4 M40i BMW X7 X7 xDrive40i | 22 complaints (a: filed as M340i, 540i, 740i, M440i, M240i) | 0 | 62 (68 videos, 36 naming 2023) | brakes, stability control, tires |
| 2024 | BMW 3 Series M340i, M340i xDrive BMW 5 Series 540i xDrive BMW 7 Series 740i, 740i xDrive BMW X5 X5 sDrive40i, X5 xDrive40i BMW Z4 Z4 M40i BMW X3 X3 M40i BMW X6 X6 xDrive40i BMW 4 Series M440i, M440i xDrive BMW 2 Series M240i, M240i xDrive BMW X4 X4 M40i BMW X7 X7 xDrive40i | 10 complaints (a: filed as 540i, 740i, M440i, M240i) | 0 | 62 (67 videos, 40 naming 2024) | brakes, stability control, backup camera |
| 2025 | BMW 3 Series M340i, M340i xDrive BMW 5 Series 540i xDrive BMW 7 Series 740i, 740i xDrive BMW X5 X5 sDrive40i, X5 xDrive40i, X5 xDrive50e BMW Z4 Z4 M40i BMW X6 X6 xDrive40i BMW 2 Series M240i, M240i xDrive BMW X4 X4 M40i BMW X7 X7 xDrive40i | 3 complaints (a: filed as 540i, M240i) | 0 | 62 (45 videos, 20 naming 2025) | wheels, locks & latches, electrical |
| 2026 | BMW 3 Series M340i, M340i xDrive BMW 5 Series 540i xDrive BMW 7 Series 740i, 740i xDrive BMW X5 X5 sDrive40i, X5 xDrive40i, X5 xDrive50e BMW Z4 Z4 M40i BMW X6 X6 xDrive40i BMW 4 Series M440i, M440i xDrive BMW 2 Series M240i, M240i xDrive BMW X7 X7 xDrive40i | all engines combined: BMW 3 Series 1 complaints; BMW 5 Series 1 complaints; BMW 7 Series 0 complaints; BMW X5 27 complaints; BMW Z4 0 complaints; BMW X6 3 complaints; BMW 4 Series 2 complaints; BMW 2 Series 1 complaints; BMW X7 7 complaints | 0 | not enough videos | — |
Known issues on record
- Brake-assist recall (engine software, 2020) (Recall). On some 2020 M340i and M340i xDrive cars, the engine software could cut brake assist during engine start. Full mechanical braking stays available. Fix: Dealer updates the engine software for free (NHTSA 21V-598). 1 owner complaint to NHTSA mention it (G20 340i).
- Oil filter housing leaks (Parts seller). The plastic housing and its gaskets can warp with heat and leak oil or coolant, often around 60,000–100,000 miles. Fix: Replace the housing and gaskets. 1 owner complaint to NHTSA mention it (F30 340i).
- Coolant loss (Owner-reported). Owners report coolant leaks. A parts seller names the water pump seal and the heat management module as common sources. 2 owner complaints to NHTSA mention it (G20 340i).
- Valve cover and PCV (Owner-reported). Valve cover gasket leaks and PCV valve faults are the most-reported B58 problems on owner forums, per SlashGear. 3 owner complaints to NHTSA mention it (G20 340i).
- Brake-assist recall (engine software) (Recall). On about 13,000 2020–2021 Supras, engine software could damage the part that powers brake assist on certain starts, lengthening stops. Fix: Dealer updates the engine computer for free (NHTSA 21V-598).
Sources: Toyota dealer notice, Safety Recall 21TA04 / NHTSA 21V-598 (Aug 2021), FCP Euro: BMW B58 engine parts and common problems, SlashGear: Common problems with BMW's B58 engines, according to owners (Oct 2024). The same list as on the 340i page, the GR Supra page.
Every US version with this engine
| Model and version | Years | Power |
|---|---|---|
| BMW 3 Series 340i | 2016–18 | 322 hp · 332 lb-ft |
| BMW 3 Series 340i xDrive | 2016–19 | 322 hp · 332 lb-ft |
| BMW 3 Series M340i | 2020–24 | 382 hp · 369 lb-ft |
| BMW 3 Series M340i xDrive | 2020–24 | 382 hp · 369 lb-ft |
| BMW 3 Series M340i | 2025–26 | — |
| BMW 3 Series M340i xDrive | 2025–26 | — |
| BMW 5 Series 540i | 2017–23 | 335 hp · 332 lb-ft |
| BMW 5 Series 540i xDrive | 2017–23 | 335 hp · 332 lb-ft |
| BMW 5 Series 540i xDrive | 2024–26 | 375 hp · 398 lb-ft |
| BMW 7 Series 740i | 2016–19 | 322 hp · 332 lb-ft |
| BMW 7 Series 740i xDrive | 2017–19 | 322 hp · 332 lb-ft |
| BMW 7 Series 740i | 2020–22 | 335 hp · 332 lb-ft |
| BMW 7 Series 740i xDrive | 2020–22 | 335 hp · 332 lb-ft |
| BMW 7 Series 745e xDrive | 2020–22 | — |
| BMW 7 Series 740i | 2023–26 | 375 hp · 398 lb-ft |
| BMW 7 Series 740i xDrive | 2024–26 | 375 hp · 398 lb-ft |
| BMW X5 X5 xDrive40i | 2019–23 | 335 hp · 332 lb-ft |
| BMW X5 X5 sDrive40i | 2020–23 | 335 hp · 332 lb-ft |
| BMW X5 X5 xDrive45e | 2021–23 | — |
| BMW X5 X5 sDrive40i | 2024–26 | 375 hp · 398 lb-ft |
| BMW X5 X5 xDrive40i | 2024–26 | 375 hp · 398 lb-ft |
| BMW X5 X5 xDrive50e | 2025–26 | — |
| BMW Z4 Z4 M40i | 2020–26 | 382 hp · 369 lb-ft |
| BMW X3 X3 M40i | 2018–19 | 355 hp · 369 lb-ft |
| BMW X3 X3 M40i | 2020–24 | 382 hp · 369 lb-ft |
| BMW X6 X6 sDrive40i | 2020–21 | 335 hp · 332 lb-ft |
| BMW X6 X6 xDrive40i | 2020–23 | 335 hp · 332 lb-ft |
| BMW X6 X6 xDrive40i | 2024–26 | 375 hp · 398 lb-ft |
| BMW 4 Series 440i | 2017–20 | 322 hp · 332 lb-ft |
| BMW 4 Series 440i xDrive | 2017–20 | 322 hp · 332 lb-ft |
| BMW 4 Series M440i | 2021–26 | 382 hp · 369 lb-ft |
| BMW 4 Series M440i xDrive | 2021–26 | 382 hp · 369 lb-ft |
| BMW 2 Series M240i | 2017–21 | 335 hp |
| BMW 2 Series M240i xDrive | 2017–21 | 335 hp |
| BMW 2 Series M240i M Performance | 2019–20 | 335 hp |
| BMW 2 Series M240i xDrive M Performance | 2019–20 | 335 hp |
| BMW 2 Series M240i xDrive | 2022–26 | 382 hp · 369 lb-ft |
| BMW 2 Series M240i | 2023–26 | 382 hp · 369 lb-ft |
| BMW X4 X4 M40i | 2019 | — |
| BMW X4 X4 M40i | 2020–25 | 382 hp · 369 lb-ft |
| BMW X7 X7 xDrive40i | 2019–22 | 335 hp · 332 lb-ft |
| BMW X7 X7 xDrive40i | 2023–26 | 375 hp · 398 lb-ft |
Versions and years: EPA (fueleconomy.gov). Engine and power: Wikipedia, BMW B58 (BMW ratings; US figures can differ by a few hp).
Quick answers
What cars have the BMW B58 engine?
In the US: the 2 Series, 3 Series, 4 Series, 5 Series, 7 Series, X3, X4, X5, X6, X7, Z4, model years 2016–2026. See the version table for each one.
Is the B58 reliable?
Mostly, if the recalls were done. YouTube owner tone 59/100, #9 of 165 engines with a YouTube study (in the top third); 2 engine-related recalls on record, 5 known issues listed below. The most owner complaints (about any part of the car) filed under version names that used this engine were for the 2020 (57). Counts follow sales, so this is not a failure rate. Government complaints are filed by model and year, not engine, and they cover the whole car, so none of these numbers is an engine failure rate. We only credit a number to this engine where the version name or the model year leaves no doubt. Have any used car inspected.
How much horsepower does the B58 make?
BMW rated it at 255 to 382 hp in US versions, depending on the car and year.