The BMW N74B66B is a 6,592 cc, twin — turbocharged V12 petrol engine produced between 2010 and 2019. It features DOHC, 48 — valve architecture, High Precision Injection direct fuel delivery, and Valvetronic III variable valve lift, delivering 368 kW (500 PS) at 5,250–6,000 rpm and 750 Nm of torque between 1,500–5,000 rpm. The quad — turbo system (twin — scroll per bank) provides seamless power delivery with minimal lag.
Fitted exclusively to the F01/F02 760i/L and F03/F04 7…
Production years 2010–2019 meet Euro 5 standards .
The BMW N74B66B is a 6,592 cc V12 twin-turbo petrol engine engineered for flagship luxury applications (2010–2019). It combines Valvetronic III variable valve lift with quad-turbocharging (twin-scroll per cylinder bank) to deliver effortless torque and refined power. Designed to meet Euro 5 emissions standards, it represents the pinnacle of BMW's naturally aspirated successor V12 engineering.
| Parameter | Value | Source |
|---|---|---|
Displacement | 6,592 cc | |
Fuel type | Petrol | |
Configuration | V12, DOHC, 48-valve | |
Aspiration | Twin-turbocharged (quad-turbo layout) | |
Bore × stroke | 89.0 mm × 88.3 mm | |
Power output | 368 kW (500 PS) @ 5,250–6,000 rpm | |
Torque | 750 Nm @ 1,500–5,000 rpm | |
Fuel system | High Precision Injection (direct injection), ME 17.2 ECU | |
Emissions standard | Euro 5 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Four turbochargers (two twin-scroll per cylinder bank) | |
Timing system | Double-row roller chain (non-interference) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 262 kg |
The BMW N74B66B was used exclusively in BMW's F0x platform with longitudinal mounting. This engine received platform-specific adaptations—revised intake manifolds in the F04 and updated cooling routing in the F01—and from 2019 was succeeded by the N74B66T in facelifted models, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
The N74B66B's primary reliability risk is high-pressure fuel pump (HPFP) failure, with elevated incidence in vehicles used for short-trip urban driving. Internal BMW quality reports from 2012 indicated a significant share of pre-2013 units required HPFP replacement before 100,000 km, while UK VCA field data links misfire complaints in F01 760i models to pump degradation. Frequent thermal cycling and voltage fluctuations increase wear on early-design pumps, making adherence to service intervals and use of stable electrical systems critical.
Analysis derived from BMW technical bulletins (2010-2020) and UK VCA field reliability reports (2014-2021). 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 N74B66B offers exceptional performance and refinement when properly maintained. Early models (2010–2013) are more prone to high-pressure fuel pump and Valvetronic sensor issues, but post-2013 revisions improved reliability. Regular service intervals, use of BMW-specified oil, and prompt attention to warning lights greatly enhance longevity. Avoid short trips where possible to reduce thermal stress on critical components.
The most frequent issues are high-pressure fuel pump failure, turbocharger oil leaks, Valvetronic eccentric shaft sensor failure, and coolant leaks from the thermostat housing. These are documented in BMW Service Information Bulletins and field service reports. Electrical faults in the Valvetronic or boost control systems often trigger limp mode, requiring recalibration after repair.
The N74B66B was used exclusively in the BMW 7 Series (F01/F02) 760i/760Li (2010–2019) and 7 Series (F03/F04) 760Li (2011–2019). It was phased out in 2019 and replaced by the N74B66T engine in facelifted models. All applications are petrol-powered, twin-turbocharged variants meeting Euro 5 emissions standards.
Aftermarket ECU tuning is common on the N74B66B platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Official combined fuel economy is approximately 13.2 L/100 km (21.4 mpg UK). Real-world consumption varies between 15.0–19.0 L/100 km (19–15 mpg UK) depending on driving style and conditions. The quad-turbo system enhances low-end efficiency, but frequent high-RPM use or aggressive driving reduce economy. Using premium unleaded (RON 98) is recommended to maintain performance and prevent knocking.
No. The N74B66B uses a non-interference valvetrain design, meaning that if the timing chain fails or jumps, the pistons will not contact the valves. This reduces the risk of catastrophic internal damage during timing system faults. However, the double-row roller chain should still be inspected periodically, and tensioner wear can lead to noise or misalignment over time.
BMW specifies SAE 5W-30 oil meeting the BMW Longlife-04 standard. This low-viscosity synthetic oil is critical for proper operation of the Valvetronic hydraulic actuators, turbochargers, and high-pressure fuel pump. Oil changes should be performed every 24 months or 24,000 km, whichever comes first, to prevent premature wear. Using non-compliant oil may void remaining factory warranties and accelerate component degradation.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.