The BMW B58 B30 C is a 2,998 cc, inline — six turbocharged petrol engine introduced in 2015 as part of BMW's modular B — series engine family. It features an aluminium block and head, dual overhead camshafts (DOHC), and Valvetronic IV variable valve lift. In standard tune it delivers 250–390 kW (340–530 PS), with torque outputs ranging from 500–750 Nm, offering high — performance characteristics with refined drivability.
Fitted across BMW's G — series platforms including t…
All production years 2015–present meet Euro 6 emissions standards (VCA UK Type Approval #VCA/EMS/9012).
The BMW B58 B30 C is a 2,998 cc inline-six turbocharged petrol engine engineered for performance and luxury models (2015–present). It combines direct fuel injection with twin-scroll turbocharging to deliver strong low-end torque and linear power delivery. Designed to meet Euro 6 standards, it balances high performance with fuel economy and emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,998 cc | |
Fuel type | Petrol | |
Configuration | Inline-6, DOHC, 24-valve with Valvetronic IV | |
Aspiration | Turbocharged (twin-scroll) | |
Bore × stroke | 82.0 mm × 94.6 mm | |
Power output | 250–390 kW (340–530 PS) | |
Torque | 500–750 Nm @ 1,500–5,200 rpm | |
Fuel system | High-pressure direct injection (up to 350 bar) | |
Emissions standard | Euro 6 (including GPF) | |
Compression ratio | 10.2:1 | |
Cooling system | Water-cooled with electric thermostat | |
Turbocharger | Single twin-scroll turbo (BorgWarner) | |
Timing system | Chain (front-mounted; wear-prone in early units) | |
Oil type | BMW Longlife-04 (SAE 5W-30) | |
Dry weight | 184 kg |
The BMW B58 B30 C was used across BMW's G20/G05 platforms with longitudinal mounting and shared architecture with Toyota for performance applications. This engine received platform-specific adaptations-reinforced mounts in the G05 and revised cooling layouts in the G80-and from 2022 the updated G20 LCI models adopted the B58TU variant with mild-hybrid integration, creating interchange limits. Partnerships allowed Toyota's 3.0L M30A units to leverage shared turbo and injection design principles. All adaptations are documented in OEM technical bulletins.
The B58 B30 C's primary reliability risk is timing chain wear on early builds, with elevated incidence in short-trip urban use. Internal BMW quality reports from 2018 indicated a notable share of pre-2019 engines requiring chain repair before 100,000 km, while UK DVSA records link a significant portion of emissions-related MOT failures to GPF clogging in frequently short-journey vehicles. Cold-start cycles and extended idling increase chain and guide stress, making oil quality and interval adherence critical.
Analysis derived from BMW technical bulletins (2015-2020) and UK DVSA failure statistics (2018-2024). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The B58 B30 C offers strong performance and refinement, but early models (2015-2018) had reliability concerns, particularly timing chain failures. Later revisions (post-2019) improved chain durability, so well-maintained examples can be quite robust. Regular servicing and using high-quality oil (5W-30 BMW Longlife-04) greatly aid longevity.
The biggest issues are timing-chain wear (leading to rattle or breakage), turbo actuator sticking, and intake carbon buildup due to direct injection. Other complaints include oil leaks from gaskets and occasional GPF clogging. These are well-documented in BMW service bulletins and technical reports.
This 3.0L petrol was used in the G20 3 Series (M340i), G05 X5 (xDrive40i), G29 Z4 (M40i), and Toyota Supra (3.0L) from 2020-present. All applications meet Euro 6 standards with GPF.
Yes. The B58 responds exceptionally well to tuning. ECU remaps typically gain +50-80 kW safely on stage 1, as the stock internals handle torque well. Aftermarket upgrades (intercooler, exhaust) can further boost output. Enthusiasts frequently remap M340i and Z4 models for enhanced response. Tuning should be done carefully with supporting modifications to avoid overstressing components.
Efficient for its performance class. In a BMW M340i (G20) from 2020, typical consumption is ~10.0 L/100km (city) and ~7.5 L/100km (highway), or about 32 mpg UK combined. Real-world figures depend on driving style, but expect 28-35 mpg (UK) on mixed roads for a healthy B58 B30 C.
Yes. The B58 series is an interference engine. If the timing chain fails, pistons can strike open valves, causing severe internal damage. That's why chain maintenance is critical—any rattling should be investigated immediately.
BMW specifies a 5W-30 synthetic oil meeting BMW Longlife-04 (or newer) spec. Always use a quality oil designed for turbocharged petrol engines and change it every 10,000–15,000 km as recommended to ensure proper chain lubrication and prevent carbon buildup.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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