Description
About This Engine
The BMW B58 is widely regarded as BMW's best modern turbocharged inline-six engine and one of the strongest turbocharged engines produced by any manufacturer in its displacement class. Introduced in 2015 as the replacement for the N55, it has been named to the Ward's World 10 Best Engines list five times and has earned enthusiast praise as 'the modern 2JZ' for its combination of factory reliability and extraordinary tuning potential on stock internals.
Two engineering decisions made the B58 fundamentally different from the N55 it replaced. First, a closed-deck block design: unlike the N55's open-deck construction where the cylinder walls have gaps in the water jacket, the B58 has solid material surrounding the cylinder walls throughout. This dramatically reduces cylinder bore distortion under boost and heat, improving both reliability and the engine's ability to handle high boost pressure. Second, a forged steel crankshaft and drop-forged cracked connecting rods: components that are meaningfully stronger than the N55's comparable hardware and have been documented to survive 600 to 700 horsepower on stock internals.
The B58TU1 technical update introduced in 2018 to 2019 added a larger turbocharger, revised cylinder head with improved combustion chambers, a higher-pressure fuel injection system (350 bar vs the Gen 1's 200 bar), and split the B58 into ML (335 hp, middle output) and OL (382 hp, high output) variants. The OL variant powers the M340i, M240i, Z4 M40i, and Toyota GR Supra 3.0- the same engine architecture used in multiple brands simultaneously.
Signs You Need a Replacement Engine
- Coolant loss without visible external leak- cracked plastic expansion tank (common on higher-mileage B58 units) or water pump failure
- Oil leaks at valve cover gasket or oil filter housing- the two most common B58 external oil leak points
- Rough idle or misfires- carbon buildup on intake valves from direct injection, particularly on high-mileage examples. Carbon buildup requires walnut blasting to clean.
- PCV system fault codes or oil mist in intake- PCV valve built into the valve cover can fail causing crankcase pressure buildup
- VANOS fault codes or rough running- VANOS solenoid wear on high-mileage units or those with extended oil change intervals
- Turbo wastegate rattle at idle- more common on tuned engines running higher boost, audible as a faint rattling at idle
Known Problems With This Engine
- Carbon buildup on intake valves- inherent to direct injection B58 engines: Direct injection sprays fuel directly into the cylinders, bypassing the intake valves. This means the intake valves accumulate carbon deposits from the PCV system without fuel washing them clean (as port injection does). At 50,000 to 60,000 miles most B58 engines benefit from walnut blasting to clean the intake valves. Symptoms include rough idle, hesitation, and reduced response. This is a maintenance item, not a defect.
- Valve cover gasket leak: The valve cover gasket on the B58 seeps with age- typically becoming apparent at 50,000 to 100,000 miles. This is more common on engines run at high temperatures frequently. We inspect the valve cover area before shipping.
- Cooling system: The B58's plastic coolant expansion tank and water pump housing can crack under repeated heat cycling. We inspect the cooling system connection points before shipping. Service the cooling system completely at installation.
- PCV valve failure: The PCV (positive crankcase ventilation) valve is integrated into the B58 valve cover. PCV failure causes increased crankcase pressure and oil consumption. We note any PCV-related indicators before shipping.
- B58 Gen 1 vs B58TU1 compatibility: The Gen 1 B58 (2015 to 2017) and the B58TU1 (2018 onward) have different cylinder heads, ECU calibrations, and some different ancillary components. They are not directly interchangeable without ensuring matching ECU and wiring. We confirm the generation before every order ships.
BMW B58 Generations and Power Variants
The B58 was introduced in 2015 and updated significantly in 2018:
| Generation | Years | HP | Torque | Key Applications and Notes |
|---|---|---|---|---|
| B58B30M0 (Gen 1) | 2015 to 2017 | 322 to 335 hp | 332 to 369 lb-ft | 340i, 440i, 240i, 740i, X3 M40i, X5 40i. Standard twin-scroll turbo. 200 bar fuel injection. |
| B58TU1 ML (Middle Output) | 2018 onward | 335 hp | 369 lb-ft | Updated 340i, 440i, 240i, 540i. Revised head and turbo. 350 bar fuel injection. Exhaust manifold integrated into head on some variants. |
| B58TU1 OL (High Output) | 2018 onward | 382 to 388 hp | 369 lb-ft | M340i, M440i, M240i, Z4 M40i, Toyota GR Supra 3.0. Larger turbo. Same block as ML but different calibration and turbocharger. |
| B58TU2 | 2022 onward | Variable | Variable | Second technical update. New cylinder head, revised Vanos, revised combustion chambers. Most recent variant- confirm compatibility carefully. |
What Is Included- What Is Not Included
| INCLUDED | Engine assembly as removed from donor vehicle. Specific accessories confirmed before shipping. |
|---|---|
| NOT INCLUDED | Turbocharger (confirm- may or may not be present), intercooler and charge pipes, ECU and wiring harness, alternator, power steering pump, cooling system components. |
| Critical Note | Service the complete cooling system at installation. Replace the expansion tank and water pump regardless of apparent condition- both are known failure points on aged B58 units. |
| Core Note | No core charge. |
Vehicle Compatibility
The BMW B58 family powers an extensive range of BMW and Toyota vehicles:
| BMW 340i / 440i / 240i (40i designation models) | 2016 onward- B58B30M0 Gen 1 or B58TU1 ML |
|---|---|
| BMW M340i / M440i / M240i (M Performance) | 2019 onward- B58TU1 OL high-output variant |
| BMW 540i / 740i / 840i | 2017 onward- B58 Gen 1 or TU1 depending on year |
| BMW X3 M40i / X4 M40i / X5 40i / X6 40i | 2018 onward |
| BMW Z4 M40i | 2019 onward- B58TU1 OL |
| Toyota GR Supra 3.0 | 2020 onward- B58TU1 OL (Toyota-tuned variant, 382 hp) |
The B58 is popular in the tuning and swap community due to its closed-deck construction and extraordinary tuning potential. Common swaps include into older BMW E-series chassis and custom builds. Proper ECU integration is the most complex aspect of any B58 swap. Call (240) 301-0095 with your specific project and we will advise on compatibility.
Transmission compatibility: ZF 8HP 8-speed automatic- standard on most B58 applications | BMW 6-speed manual- available on select models (340i, M240i) | Confirm your specific vehicle's transmission before ordering.
Not sure if this fits? Call (240) 301-0095. We verify fitment before every order ships.
Common Names and Search Terms
| BMW B58 | Most common buyer search |
|---|---|
| B58B30 | Full engine code |
| BMW 3.0 turbo engine | Displacement and forced induction search |
| B58 engine | Short code buyer |
| 340i engine | Application-specific buyer |
| M340i engine | High-output variant buyer |
| GR Supra engine | Toyota Supra buyer- cross-brand application |
| BMW inline-6 turbo | Architecture designation |
| B58TU engine | Technical update version buyer |
| B58 vs N55 | Comparison research buyer |
Used OEM vs Rebuilt- Which Is Right for You?
Used OEM is the right choice for a 340i, 540i, M340i, or GR Supra replacement where a generation-confirmed, known-issue-assessed unit is the foundation. Our B58 units are documented with generation, valve cover condition, and cooling system indicators assessed before shipping.
A specialist remanufactured B58 makes sense if you need fresh tolerances with longer warranty coverage. B58 remanufacturers are available in the performance BMW community. Call us to discuss current unit condition and what fits your application and budget.
Condition and Inspection Process
- Full external inspection- block, head, valve cover area, cooling system connection points, and all accessible engine surfaces
- B58 generation confirmed- B58B30M0 or B58TU1 ML/OL documented before shipping
- Valve cover gasket area inspected for seepage
- Cooling system expansion tank and water pump housing inspected for visible cracking
- PCV valve cover integration inspected for indicators
- VANOS solenoid area inspected
- Carbon buildup assessment where accessible- intake manifold area inspected
Mileage varies by unit. Where available from the donor vehicle we provide it. Where it cannot be confirmed, we disclose this before your order is placed.
Buyer Tips- What to Know Before You Order
- Service the cooling system at installation: Replace the expansion tank and water pump at installation regardless of apparent condition. Both are known failure points on B58 engines over 60,000 miles. The cost is approximately $300 to $500 in parts. The cost of an overheated B58 is catastrophic.
- Carbon buildup- plan for walnut blasting: Direct injection engines like the B58 accumulate carbon on intake valves over time. At installation or within the first 10,000 to 15,000 miles, arrange for a walnut blasting service to clean the intake valves. Symptoms of significant carbon buildup include rough idle and hesitation.
- B58 Gen 1 vs B58TU1 ECU compatibility: The Gen 1 and TU1 use different ECU calibrations. Confirm that the replacement engine's generation matches your vehicle's existing ECU and wiring harness configuration or plan for appropriate adaptation.
- Oil quality and intervals: Use BMW-approved full synthetic 0W-30 or 5W-30 meeting BMW Longlife-17 FE+ specification. Change every 7,500 miles maximum for performance longevity- do not use BMW's factory 10,000 to 15,000 mile interval recommendation for high-performance use.
- Tuning potential: If you plan to tune the B58, the closed-deck block can handle significantly more boost than the N55. Stage 1 tunes (downpipe and ECU tune) typically produce 370 to 420 hp on stock internals. Built motor packages at 500 to 700 hp have been well documented.
Why Buy From Vaz Auto Solutions
- B58 generation confirmed- B58B30M0 or B58TU1 ML/OL documented before you pay
- Valve cover, PCV, and cooling system connection points specifically inspected
- Full external inspection documentation before shipping
- Carbon buildup assessment disclosed- buyers prepared for walnut blasting service
- No core charge- keep your old engine
- Free freight pallet delivery to all 50 states
- 15 day replacement warranty on internal engine defects
- Call (240) 301-0095- speak with someone who understands B58 generations and the key differences from the N55
David Martinez (verified owner) –
I recently bought a BMW B58 engine from Vaz Auto Solutions, and I am extremely pleased with my purchase. The engine was well-packaged and arrived without any issues. The quality of the engine exceeded my expectations, and my car’s performance has never been better. The customer service team was very helpful and answered all my queries. I highly recommend this site for anyone looking for reliable auto parts.
Marcel Campbell (verified owner) –
Purchasing a BMW B58 engine from Vaz Auto Solutions was a fantastic experience. The engine arrived on schedule and was in perfect condition. The detailed descriptions and support from the team made me confident in my purchase. My vehicle’s performance has drastically improved since the installation. I highly recommend Vaz Auto Solutions for anyone in need of quality auto parts.
Kyle M., Dallas TX –
Needed a B58TU1 OL after my M340i suffered a coolant system failure that cascaded into a head gasket issue. Vaz confirmed the TU1 OL generation before I paid- critical for ECU compatibility. Full external inspection documentation provided. My BMW specialist confirmed the engine on arrival. Had walnut blasting done at installation. Running perfectly and making more power than ever with a stage 1 tune.
Ryan T., Seattle WA –
Bought a B58 for my GR Supra after a turbo failure caused internal engine damage. Vaz confirmed the TU1 OL variant which is what the Supra uses. Cooling system connection points inspected- one hose fitting showed a slow seep, disclosed before I bought. Replaced at installation. Engine is in and the Supra runs exactly as it should.