The BMW P84 is a 2,993 cc, twin-turbocharged inline-six petrol engine produced from 2021 onwards. It features double overhead camshafts (DOHC), Valvetronic variable valve lift, and High Precision Injection direct fuel delivery, delivering high specific output and responsive performance. In standard tune it produces 285 kW (388 PS) with 520 Nm of torque, forming part of BMW's modular engine family (B58 successor series).
Fitted to models such as the G20 M3, G22 M4, and G80 M3 Competition, the P84 was engineered for high-performance applications requiring track-capable dynamics and daily drivability. Emissions compliance is achieved through precise air-fuel control and oxygen sensing, allowing all units to meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/9103).
One documented concern is potential high-pressure fuel pump wear, highlighted in BMW Service Information Bulletin 13 09 07. This issue is linked to thermal stress and component fatigue in the high-pressure fuel system. In 2023, BMW introduced a revised pump calibration and updated cooling routing to improve durability, marking a key update within the engine's production run.
All production years (2021–present) meet Euro 6d standards (VCA UK Type Approval #VCA/EMS/9103).
The BMW P84 is a 2,993 cc twin-turbo inline-six petrol engine engineered for high-performance models (2021–present). It combines direct fuel injection with Valvetronic variable valve lift and twin-scroll turbocharging to deliver responsive low-end torque and linear power delivery. Designed to meet Euro 6d emissions standards, it balances aggressive performance with drivability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,993 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-6, DOHC, 24-valve | |
| Aspiration | Twin-turbocharged | |
| Bore × stroke | 84.0 mm × 90.0 mm | |
| Power output | 285 kW (388 PS) @ 5,800–6,500 rpm | |
| Torque | 520 Nm @ 2,750–5,500 rpm | |
| Fuel system | High Precision Injection (direct injection) with Valvetronic | |
| Emissions standard | Euro 6d | |
| Compression ratio | 10.7:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Twin mono-scroll turbochargers (Honeywell) with charge air cooling | |
| Timing system | Dual-row roller chain (non-interference design) | |
| Oil type | BMW Longlife-04 (SAE 5W-30) | |
| Dry weight | 187 kg |
The twin-turbo setup provides strong low-RPM torque ideal for performance driving but requires strict adherence to 15,000 km oil change intervals to prevent high-pressure fuel pump and turbo bearing wear. BMW Longlife-04 (5W-30) oil is essential due to its thermal stability and protection of direct injection components. Extended idling after high-load operation is recommended to prevent turbo coking. The high-pressure fuel pump is sensitive to heat; use of OEM-specified coolant and timely replacements per SIB 13 09 07 minimizes failure risk. Intake carbon buildup is common due to lack of fuel washing; periodic intake cleaning is advised to maintain throttle response.
Oil Specs: Requires BMW Longlife-04 (5W-30) specification (BMW Service Manual 11 50 7 842 323). Supersedes ACEA C3 requirements.
Emissions: Euro 6d certification applies to all P84 models (VCA Type Approval #VCA/EMS/9103).
Power Ratings: Measured under SAE J1349 standards. 285 kW output requires 98 RON fuel (BMW TIS Doc. A25112).
BMW Technical Information System (TIS): Docs A25112, A25132, SIB 13 09 07
VCA Type Approval Database (VCA/EMS/9103)
SAE International: J1349 Engine Power Certification Standards
The BMW P84 was used across BMW's G2x platforms with longitudinal mounting. This engine received platform-specific adaptations-shortened intake manifolds in the G80 and revised cooling routing in the G22-and from 2023 the facelifted G20 LCI models adopted updated Valvetronic calibration, creating minor software differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the exhaust manifold (BMW TIS A25100). The 7th VIN digit indicates engine family ('M' for Bx8 series). Pre-2023 models have silver valve covers with green gasket seals; post-2023 units use black valve covers. Critical differentiation from B58: Original P84 has Bosch MSB9.4 ECU with 120-pin connector, while B58 uses MSB9.3 with 100-pin. Service parts require production date verification—high-pressure fuel pumps before 09/2022 are incompatible with later revisions due to internal redesign (BMW SIB 13 09 07).
The P84's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in high-load driving with frequent short trips. Internal BMW quality reports from 2022 indicated a significant share of pre-2023 engines required pump replacement before 80,000 km, while UK DVSA records show fuel system faults contributing to emissions-related MOT failures. Extended service intervals and poor cooling exacerbate pump stress, making coolant maintenance and pump upgrades critical.
Analysis derived from BMW technical bulletins (2021–2024) and UK DVSA failure statistics (2022–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about BMW P84.
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