The BMW N62 B44 A is a 4,398 cc, V8 naturally aspirated petrol engine produced between 2003 and 2008. It features DOHC, 32 — valve configuration, and BMW's Valvetronic II variable valve lift system, delivering 225 kW (306 PS) and 440 Nm of torque. Its smooth power delivery and high — RPM capability provide a refined driving experience typical of BMW's luxury performance philosophy.
Fitted to the E65 7 Series, E60 5 Series, and E53 X5, the N62 B44 A was engineered for effortless a…
All production years 2003–2008 meet Euro 4 emissions standards .
The BMW N62 B44 A is a 4,398 cc V8 naturally aspirated petrol engine engineered for luxury and SUV platforms (2003–2008). It combines Valvetronic II variable valve lift with dual overhead camshafts to deliver smooth power delivery and improved fuel efficiency. Designed to meet Euro 4 standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 4,398 cc | |
Fuel type | Petrol | |
Configuration | V8, DOHC, 32-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 92.0 mm × 82.7 mm | |
Power output | 225 kW (306 PS) @ 6,100 rpm | |
Torque | 440 Nm @ 3,600–4,500 rpm | |
Fuel system | Bosch Motronic ME7.2 sequential port fuel injection | |
Emissions standard | Euro 4 | |
Compression ratio | 10.6:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row timing chain | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 210 kg |
The BMW N62 B44 A was used across BMW's E65, E60, and E53 platforms with longitudinal mounting. This engine received platform-specific adaptations-integrated Valvetronic on all units-and from 2008 the facelifted E65 LCI adopted the N62B48 variant with increased displacement, 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.
Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 N62 B44 A offers smooth performance and solid engineering, but early models (2003–2005) are prone to timing chain guide wear. Later revisions and proper maintenance significantly improve longevity. Regular cooling system service, use of correct oil (5W-30 BMW Longlife-01), and prompt attention to cold-start rattles are essential for reliability.
Key issues include timing chain guide wear (especially pre-2005), cooling system failures (thermostat, water pump), vacuum leaks from intake hoses, and oil leaks from valve cover and rear main seal. These are documented in BMW service bulletins and require OEM-specified parts for proper repair.
The N62 B44 A was used in the E65 7 Series 745i (2003–2008), E60 5 Series 545i (2003–2007), and E53 X5 4.4i (2003–2006). It was replaced by the N62B48 in 2008 with increased displacement and updated engine management. No cross-manufacturer applications are documented for this variant.
Aftermarket ECU tuning is common on the N62B44A 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.
In an E65 745i, combined consumption is ~13.5 L/100km (21 mpg UK). City driving may see 15–17 L/100km (19–14 mpg), while highway cruising can achieve ~10.0 L/100km (28 mpg). Real-world figures depend on driving style and vehicle condition.
Yes. The N62 series is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, causing severe internal damage. Chain maintenance and tensioner inspection are critical, especially given the engine's high-RPM operation.
BMW specifies 5W-30 synthetic oil meeting BMW Longlife-01 spec. Change intervals should not exceed 15,000 km. Proper oil ensures adequate protection for camshafts, lifters, and the timing chain, especially under sustained high-RPM use.
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.