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The reliable way to identify a B58 is to match the car’s exact model year, trim, body style and market to manufacturer technical information or VIN-specific records that name the engine. A badge such as “3 Series” or “Supra” is not enough: BMW has used several engines within the same model family, and the fifth-generation Toyota GR Supra was sold with either a B58-powered 3.0-liter inline-six or a separate 2.0-liter four-cylinder.
This distinction matters for buying, parts ordering, insurance descriptions and diagnosis. The same badge can cover different powertrains, and published horsepower can change without the engine family changing. Use the model designation as a starting point, then confirm the engine code and the applicable year and market.
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Confirmed BMW and Toyota B58 applications
The table below lists the applications supported by official U.S. model information. It is a representative guide, not a complete worldwide BMW fitment catalogue. Always verify the individual vehicle before buying parts, diagnosing a fault or advertising a used car.
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| Brand | Model year | Exact application | Engine identification | Market and evidence scope |
|---|---|---|---|---|
| Toyota | 2020 | GR Supra 3.0 | Turbocharged 3.0-liter inline-six B58 | U.S. fifth-generation (A90) launch specification |
| Toyota | 2021 | GR Supra 3.0 | B58-powered 3.0-liter inline-six | U.S. model year; Toyota increased output and added a separate 2.0-liter four-cylinder grade |
| Toyota | 2024 | GR Supra 3.0 and 3.0 Premium | Toyota states that all 3.0 Supra models use the B58 | U.S. announcement; engine-code identification comes from Toyota’s 2024 announcement |
| Toyota | 2025 | GR Supra 3.0 and 3.0 Premium | Inline-six on Toyota’s model page; the B58 identification is supported by Toyota’s 2024 statement about 3.0 models | U.S. model page; confirm the final technical sheet for any later model year |
| BMW | 2016 | 340i sedan and related 340i launch application | B58 | BMW’s U.S. 2015 launch material identifies the 340i as the first B58 application in the 3 Series line |
| BMW | 2025 | M340i | B58B30M2 | U.S. BMW announcement; output includes 48V starter-generator assistance |
| BMW | 2025 | M440i Coupe and Convertible | B58B30M2 | U.S. BMW announcement |
| BMW | 2025 | M440i Gran Coupe | B58B30M2 | U.S. BMW announcement |
These are the specific BMW and Toyota examples established by the cited manufacturer material. They should not be expanded into a claim that every 3 Series, every 4 Series or every Supra has a B58.
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What the B58 designation means
B58 is BMW’s engine-family designation for a turbocharged 3.0-liter inline-six. In the applications covered here, Toyota uses the same BMW-developed engine family in the fifth-generation GR Supra, while BMW identifies later versions with a more specific code such as B58B30M2.
The designation is more useful than a model badge because one vehicle family can contain multiple engines. For example, a BMW 4 Series M440i is identified in the 2025 U.S. material with B58B30M2, while the 430i uses a different four-cylinder engine. Likewise, a GR Supra 3.0 has the B58, but the Supra 2.0 has a four-cylinder engine.
Engine codes can also change within the same family as calibration, emissions equipment, hybrid assistance and model-year hardware change. Treat “B58” as the family identification and preserve the full code when the manufacturer provides one. A full code is especially valuable when two vehicles share the B58 name but have different output ratings or electrical systems.
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2016 BMW 340i
BMW’s U.S. launch material from 2015 identifies the 340i as the first B58 application in the 3 Series line. That launch specification lists 320 horsepower and 330 lb-ft of torque. The year and trim matter: this evidence confirms the 2016 340i application, not every 3 Series sold before or after it.
When checking a used car advertised simply as a “3 Series,” look for the exact 340i designation and model year, then confirm the engine in the vehicle’s technical records. A 320i, 328i, 330i, 335i or another 3 Series variant cannot be assumed to have a B58 from the family name alone.
2025 BMW M340i
BMW’s 2025 U.S. announcement identifies the M340i engine as B58B30M2. BMW quotes 375 horsepower for the engine and says the 48V starter-generator can add 11 horsepower, producing 386 horsepower of total system output and 398 lb-ft of torque.
That distinction matters when comparing specifications. The 386-hp figure is a mild-hybrid system rating, not simply the combustion engine’s standalone output. A listing that says “386 hp B58” is incomplete unless it explains that the number is the combined system rating for the stated 2025 U.S. M340i application.
Do all BMW 3 Series cars have a B58?
No. The confirmed examples are the 2016 340i and the 2025 M340i. BMW has used different four-cylinder and six-cylinder engines across 3 Series trims and years. Verify the precise car rather than inferring the engine from “3 Series,” an M Sport appearance package or a seller’s description.
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Which BMW 4 Series models use the B58?
2025 M440i Coupe and Convertible
BMW’s 2025 U.S. announcement identifies the M440i Coupe and M440i Convertible with the B58B30M2. BMW gives 386 horsepower of system output and 398 lb-ft of torque for these variants, with the same 48V starter-generator explanation used for the M340i.
2025 M440i Gran Coupe
The 2025 U.S. BMW announcement also identifies the M440i Gran Coupe with B58B30M2 and quotes 386 horsepower of system output and 398 lb-ft of torque. The body style belongs in your identification checklist because an M440i Gran Coupe is a different configuration from an M440i Coupe or Convertible even though the engine family is the same in the cited year.
Why “4 Series” is not enough
The 430i versions use a different four-cylinder engine. Therefore, “BMW 4 Series” does not identify a B58. The trim must say M440i, and the model year and market must match the manufacturer’s specification. Other years or markets may use different engine codes or equipment, so the 2025 U.S. evidence should not be treated as a universal 4 Series list.
Which Toyota Supra has the B58?
2020 GR Supra 3.0
Toyota’s retrospective on the fifth-generation A90 GR Supra says the 2020 launch car used a turbocharged 3.0-liter inline-six B58 matched to an eight-speed automatic transmission. Toyota gives launch output as 335 horsepower and 365 lb-ft of torque.
The engine identification applies to the 3.0 model. The model name “GR Supra” by itself is too broad because Toyota later added a 2.0-liter version with a separate four-cylinder engine.
2021 GR Supra 3.0
For 2021, Toyota increased the 3.0-liter car’s output to 382 horsepower and 367 lb-ft of torque. Toyota also introduced the 2.0-liter turbocharged four-cylinder option. Consequently, a 2021 Supra must be identified by displacement or grade before you can infer whether it has a B58: the 3.0 does, while the 2.0 does not.
2024 GR Supra 3.0 and 3.0 Premium
Toyota’s 2024 announcement explicitly states that the B58 powers all 3.0 Supra models. It quotes 382 horsepower and 368 lb-ft of torque for the 2024 3.0 applications. The one-pound increase in the published torque figure compared with Toyota’s 2021 figure is a reminder that ratings are model-year-specific specifications, not a permanent B58 limit.
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Toyota’s 2025 model page lists 3.0 and 3.0 Premium grades with an inline-six. The explicit B58 identification comes from Toyota’s 2024 announcement that all 3.0 models use the B58, so use both pieces of information when documenting a 2025 car. Do not automatically extend that conclusion to a future model year without checking its own technical specification.
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Does the Supra 2.0 have a B58?
No. The Supra 2.0 uses a turbocharged four-cylinder, not the B58 inline-six. The 2.0 and 3.0 are separate powertrain choices within the same fifth-generation Supra range. Check the displacement and grade on the vehicle record rather than relying on the Supra name, exterior styling or automatic transmission.
B58 output by named application
Horsepower and torque are useful cross-checks only after the exact application is known. The figures below are manufacturer ratings for the named U.S. vehicles and years; they are not a universal specification for every B58 engine.
| Vehicle | Engine or system description | Horsepower | Torque | Qualification |
|---|---|---|---|---|
| 2020 Toyota GR Supra 3.0 | B58 3.0-liter inline-six | 335 hp | 365 lb-ft | Toyota launch specification for the A90 |
| 2021 Toyota GR Supra 3.0 | B58 3.0-liter inline-six | 382 hp | 367 lb-ft | Toyota’s increased 2021 rating |
| 2024 Toyota GR Supra 3.0 | B58 3.0-liter inline-six | 382 hp | 368 lb-ft | Toyota’s 2024 model announcement |
| 2016 BMW 340i | B58 | 320 hp | 330 lb-ft | BMW U.S. launch material from 2015 |
| 2025 BMW M340i | B58B30M2 plus 48V starter-generator | 375 hp engine; 386 hp system | 398 lb-ft | BMW U.S. system rating; 11 hp comes from the 48V unit |
| 2025 BMW M440i Coupe, Convertible and Gran Coupe | B58B30M2 plus 48V starter-generator | 375 hp engine; 386 hp system | 398 lb-ft | BMW U.S. rating for the specified M440i variants |
Do not identify an engine from horsepower alone. Different calibrations can produce similar numbers, and the 2025 BMW figures combine combustion-engine output with mild-hybrid assistance. Use the engine code or vehicle record first, then use output as a consistency check.
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How the applications compare
A useful comparison keeps five labels together: model year, exact trim and body style, market, engine code and rated output. On that basis, the 2016 340i and 2020 GR Supra 3.0 are both early B58 examples but have different published ratings and vehicle specifications. The 2021 Supra’s 382 hp rating cannot be substituted for the 2020 car’s 335 hp figure. Similarly, the 2025 M340i and M440i use B58B30M2, yet BMW presents their 386 hp figure as total system output because of the 48V starter-generator.
The comparison is therefore not a ranking of which B58 is “best.” It is a way to avoid mixing unlike measurements. Record whether horsepower is engine-only or system total, whether torque is quoted in lb-ft, and whether the source describes a launch specification or a later model-year update.
How to check whether a particular car has a B58
- Write down the complete identity. Record the model year, market, model family, exact trim, body style and engine displacement. “BMW 3 Series,” “BMW 4 Series” and “GR Supra” are incomplete descriptions.
- Open the manufacturer’s specification or technical-data page. Find the engine designation, not just the horsepower line. BMW’s confirmed examples name B58 or B58B30M2 directly. Toyota’s Supra information separates the 3.0 inline-six from the 2.0 four-cylinder and explicitly identifies the B58 for the 3.0 models in its 2024 announcement.
- Match the model year and market. A U.S. 2025 M440i announcement does not prove that every M440i in another market or year has identical hardware. Keep the region and year beside the engine code in your notes.
- For a used car, compare VIN-specific records. Check the build or specification records and the vehicle documents against the manufacturer’s model-year information. A VIN record is useful because it describes that individual car, but the available manufacturer material does not establish one universally authoritative VIN-decoding procedure; do not treat an unverified decoder as definitive.
- Use output as a final cross-check. Compare the published horsepower and torque only after the code and configuration agree. Preserve whether a number is engine-only or a combined mild-hybrid system rating.
Documents and details worth requesting from a seller
Ask for the window sticker, factory build sheet, registration details showing the model year, and a clear photograph of the vehicle identification information. The paperwork should agree on the trim, body style and displacement. If a seller advertises a “B58 BMW” but supplies only a generic 3 Series or 4 Series description, treat that as an unresolved claim rather than confirmation.
For a Supra, specifically ask whether the car is a 3.0, 3.0 Premium or 2.0. For a BMW, ask whether the designation is 340i, M340i, M440i Coupe, M440i Convertible or M440i Gran Coupe, and retain the market and model year. These details prevent a specification from a similar car being copied into the listing.
Common identification mistakes
Assuming every Supra is a B58
The fifth-generation Supra name covers both the 3.0 inline-six and the 2.0 four-cylinder. Only the 3.0 applications covered by Toyota’s stated specifications use the B58. Ask for the displacement or exact grade before accepting a listing.
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Assuming an M badge proves the engine
Performance styling, an M Sport package or a seller’s use of “M” does not establish the engine code. In the confirmed 2025 examples, the relevant trim names are M340i and M440i, not every BMW carrying an M-branded appearance or chassis package.
Mixing engine output with system output
The 2025 M340i and M440i ratings include 48V starter-generator assistance. Calling 386 horsepower the output of the combustion engine alone misstates BMW’s specification; BMW identifies 375 horsepower for the engine and 386 horsepower for the system.
Using one year’s number for another year
Toyota’s published Supra figures move from 335 hp and 365 lb-ft in 2020 to 382 hp and 367 lb-ft in 2021, then 382 hp and 368 lb-ft in the cited 2024 specification. BMW’s 2016 340i figures also differ from the 2025 mild-hybrid M340i figures. Keep each rating attached to its model year and trim.
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BMW’s 2025 confirmation covers the M440i Coupe, Convertible and Gran Coupe separately. A body-style label is not cosmetic bookkeeping: it is part of the configuration that must match the technical document.
Treating a representative list as a global catalogue
The BMW examples here are limited to the officially documented U.S. applications listed above. They do not establish every B58-equipped BMW model, body style, engine revision or market. If a vehicle is not in the table, that absence is not proof that it lacks a B58; it means you need the exact technical record for that car.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to record when documenting a B58 car
- Model year and sales market.
- Exact trim, such as 340i, M340i, M440i or GR Supra 3.0.
- Body style, including Coupe, Convertible, Gran Coupe or sedan.
- Displacement and cylinder layout.
- Full engine code when the manufacturer publishes it, such as B58B30M2.
- Whether the quoted horsepower is engine output or total hybrid-system output.
- The manufacturer document or VIN-specific record used for verification.
- The date and title of the specification page or announcement, since model pages can change as new years are introduced.
This record prevents a common documentation error: copying a specification from a similar-looking car and applying it to a different year, trim or market.
What is established—and what still needs checking
The documented applications establish a B58 in the 2020 and later Toyota GR Supra 3.0 examples described above, the 2016 BMW 340i, and the 2025 BMW M340i and M440i variants specifically named in BMW’s U.S. announcements. They also establish that the Supra 2.0 uses a four-cylinder instead of a B58 and that the BMW 430i uses a different four-cylinder engine.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThey do not establish an exhaustive list of all BMW B58 applications worldwide, nor do the cited Toyota extracts independently identify an engine code for every future model year. For a purchase, repair or parts-ordering decision, finish with the exact car’s manufacturer specification and VIN-specific documentation.
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Frequently Asked Questions
Which BMW models have the B58 engine?
The confirmed U.S. examples covered here are the 2016 BMW 340i, the 2025 BMW M340i, and the 2025 BMW M440i Coupe, Convertible and Gran Coupe. The 2025 M340i and M440i use the more specific B58B30M2 designation. This is not an exhaustive list of every BMW market or year.
Does my BMW 3 Series have a B58?
Check the exact year and trim. The documented examples are the 2016 340i and 2025 M340i. A generic 3 Series badge, an M Sport package or a seller’s description does not prove the engine; verify the engine code in BMW technical data or the car’s VIN-specific records.
Which Toyota Supra has the B58?
The fifth-generation GR Supra 3.0 uses the B58 in the cited Toyota specifications. Toyota identifies the 2020 launch 3.0, the 2021 3.0, and the 2024 3.0 models as B58 applications; the 2025 3.0 and 3.0 Premium are listed with an inline-six and are supported by Toyota’s statement that all 3.0 models use the B58.
Does the Supra 2.0 have a B58?
No. The Supra 2.0 uses a turbocharged four-cylinder. The B58 identification applies to the 3.0 inline-six versions, so confirm displacement and grade before assuming a Supra has the six-cylinder engine.
Is every BMW 4 Series powered by a B58?
No. The confirmed 2025 B58 applications are the M440i Coupe, M440i Convertible and M440i Gran Coupe. BMW’s 430i uses a different four-cylinder. Other years and markets require their own technical verification.
Why do B58 horsepower figures differ?
The B58 is an engine family used in different vehicles, years and calibrations. The cited figures range from 320 hp in the 2016 340i and 335 hp in the 2020 Supra 3.0 to 382 hp in later Supra specifications. BMW’s 2025 M340i and M440i figures distinguish 375 hp from the engine and 386 hp for the system with 48V assistance.
Can horsepower alone identify a B58?
No. Similar ratings can occur across different engines, and the 2025 BMW number includes mild-hybrid system assistance. Confirm the engine code or VIN-specific specification first, then use horsepower and torque only as a consistency check.
What information should I provide when asking whether a car has a B58?
Provide the model year, country or market, exact trim, body style, displacement and VIN-specific build information if available. For BMW, include whether it is a 340i, M340i or M440i variant. For Toyota, state whether it is a Supra 2.0 or 3.0 grade.
The Bottom Line
To identify a B58, verify the exact model year, trim, body style and market in manufacturer documentation or VIN-specific records. The cited Toyota applications are the GR Supra 3.0, while the cited BMW examples are the 2016 340i and 2025 M340i and M440i variants. Never infer the engine from a broad model badge, horsepower number or appearance package alone.
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