The BMW B58 is widely regarded as BMW's best modern turbocharged Inline-6 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 10 Best Engines list five times (2016, 2017, 2019, 2020, 2024) 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.
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.
| 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. |
| 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. |
| Item | Details |
|---|---|
| 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. |
The BMW B58 family powers an extensive range of BMW and Toyota vehicles:
| Vehicle | Compatibility |
|---|---|
| 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.
Transmission compatibility: ZF 8HP 8-speed automatic (standard on most B58 applications), BMW 6-speed manual (available on select models including 340i, M240i). Confirm your specific vehicle's transmission before ordering.
Every used BMW B58 we ship goes through this process:
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.
| Displacement | 2,998 cc (3.0L) |
|---|---|
| Engine Code | B58B30M0 (Gen 1) |
| Configuration | 24 valves, DOHC, Inline-6 |
| Bore X Stroke | 82 mm x 94.6 mm |
| Compression Ratio | 11.0:1 |
| Aspiration | Single twin-scroll turbocharger |
| Horsepower | 322 to 382 hp, variant dependent, confirmed at order |
| Torque | 332 to 369 lb-ft, variant dependent |
| Redline | 7,000 rpm |
| Vanos | Double VANOS, intake and exhaust |
| Valve Lift | Valvetronic variable valve lift |
| Block Design | Closed-deck, significantly stronger than N55 open-deck |
| Crankshaft | Forged steel |
| Connecting Rods | Drop-forged cracked (fractured) |
| Fuel System | High-pressure direct injection, up to 350 bar (B58TU1) |
| Block Material | Aluminum alloy with plasma arc wire spray coating |
| Production Years | 2015 to present |
| Awards | Ward's 10 Best Engines: 2016, 2017, 2019, 2020, 2024 |
| Applications | BMW 340i, 540i, M340i, X3/X4/X5/X6 M40i, Z4 M40i, Toyota GR Supra 3.0 and more |
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.
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.
Every used BMW B58 engine sold by Vaz Auto Solutions is covered by a 15 day replacement warranty from the date of delivery.
To file a claim, contact us within 15 days of delivery at (240) 301-0095 or support@vazautosolutions.com.
