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 the G20 3 Series M models, G05 X5, and G80 M3, the B58 B30 C was engineered for longitudinal mounting and shared architecture with Toyota for sports applications. Emissions compliance is achieved through a close-coupled three-way catalyst and gasoline particulate filter (GPF), enabling Euro 6 compliance across all production years. The engine supports 48V mild-hybrid integration in later models (starting 2022) for improved throttle response and torque fill.
One documented concern is premature timing chain wear observed in early production units, particularly under short-trip driving conditions. This issue, referenced in BMW Service Information Bulletin 11 52 20, is linked to inadequate lubrication of the timing chain tensioner during cold starts. From 2019, BMW implemented revised tensioner and guide components to improve durability.
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 twin-scroll turbo provides strong low-RPM torque ideal for daily driving but requires adherence to 10,000–15,000 km oil change intervals to prevent timing chain wear and turbo bearing degradation. BMW Longlife-04 (5W-30) oil is essential due to its specific formulation protecting the front-mounted chain system. Short-trip driving increases carbon buildup on intake valves; regular highway runs help mitigate this. The GPF requires periodic regeneration and can clog if short journeys dominate. Post-2019 models feature upgraded chain guides; pre-2019 units should have the tensioner upgrade per BMW SIB 11 52 20. Direct injection demands high-quality fuel meeting EN 228 standards to prevent injector deposits. Mild-hybrid variants (from 2022) add complexity with 48V starter-generator but improve efficiency and responsiveness.
Oil Specs: Requires BMW Longlife-04 (5W-30) specification (BMW SIB 11 52 20). Supersedes ACEA A3/B4 requirements.
Emissions: Euro 6 certification applies to all models (2015–present) (VCA Type Approval #VCA/EMS/9012). GPF-equipped from launch.
Power Ratings: Measured under SAE J1349 standards. 390 kW output requires 98 RON fuel quality (BMW TIS Doc. A27104).
BMW Technical Information System (TIS): Docs A27100, A27101, A27102, SIB 11 52 20
VCA Type Approval Database (VCA/EMS/9012)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped vertically on the right-side engine block near the oil filter housing (BMW TIS A27110). The 7th VIN digit indicates engine family ('B' for B-series). Pre-2019 models have silver valve covers with black plastic timing covers; post-2019 units use black valve covers. Critical differentiation from B58TU: Original B58 B30 C has Bosch MSV90 ECU with trapezoidal diagnostic port under hood, while B58TU uses MSV90 with integrated 48V interface. Service parts require production date verification - timing kits for engines before 06/2019 are incompatible with later units due to guide rail redesign (BMW SIB 11 52 20).
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.
Find answers to most commonly asked questions about BMW B58B30C.
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