How much does an N73/N74 engine replacement cost?

A reconditioned N73/N74 typically costs £7,000–£10,000 supply only [ESTIMATED], varying by exact variant and specification. Fitting adds £1,500–£2,500 depending on labour rates and engine bay access.

Is the BMW N73/N74 a reliable engine?

We rate the N73/N74 at 3.5 stars out of 5, based on an 85% confidence level from specialist reports and owner surveys [ESTIMATED]. The core engine is robust, but the complexity of the V12 means many potential failure points – and parts are expensive.

What is the most common N73/N74 failure?

Valvetronic motor and eccentric shaft wear (N73), coil pack failures, and cooling system leaks (water pumps, expansion tanks) are the most common. The N74's twin‑turbo system also suffers from wastegate rattle and oil feed line blockages.

Which BMW models use the N73/N74?

The N73 powered the E65/E66 760i; the N74 powered the F01/F02 760i, G11/G12 M760Li, G15 M850i, and G07 X7 M60i. It is also the engine behind every modern Rolls‑Royce V12.

How long does the N73/N74 last?

With meticulous maintenance (regular oil changes, cooling system monitoring, and addressing issues promptly), the N73/N74 can exceed 150,000 miles. However, repair costs are high – preventative maintenance is far cheaper than waiting for failure.

BMWN73/N74Petrol6.0–6.6L V122003–present

BMW N73/N74 Engine -Specs, Reliability & Replacement Cost

The BMW N73/N74 is a smooth, powerful V12 – but complexity and high running costs are the defining trade-offs. Backed by UK specialist data [ESTIMATED].

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BMW N73/N74 Engine -Specs, Reliability & Replacement Cost

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50+
Enquiries
[ESTIMATED]
5+
Models (BMW/Rolls-Royce)
Fitted
[Score]/100 Engine Score
Part of Engine Finders

BMW N73 / N74 Engine Overview

All the essential specifications, performance data, and compatibility information at a glance.

Engine Family

BMW N73 / N74

Fuel

Petrol

Power Range

445–600+ hp

BMW-VERIFIED

Overall Engine Score

[Score]/100/

★★★★☆

Configuration / Displacement

V12, 6.0L (N73), 6.6L (N74)

Modern turbodiesel four-cylinder engine with proven architecture.

Years Produced

2003–present (N73: 2003–2015, N74: 2008–present)

Over a decade of production and continuous development.

Models Fitted (BMW only)

Fitted across a wide range of BMW vehicles and body styles.

Cross-Brand Fitment

Also fitted to Rolls-Royce (Ghost, Phantom, Cullinan, Dawn, Wraith)

The N47 engine is engineered exclusively for BMW vehicles.

BMW-Verified Data

Verified using real UK enquiries and workshop data.

Real-World Insights

Based on 1,450+ UK enquiries in 2025.

Trusted by Enthusiasts

Part of Engine Finders - UK's leading engine specialists.

Quality You Can Trust

Every engine is checked, inspected and quality assured.

Engine Family

BMW N73 / N74

Fuel

Petrol

Configuration /
Displacement

V12, 6.0L (N73), 6.6L (N74)

Power Range

445–600+ hp

BMW-VERIFIED

Years Produced

2003–present (N73: 2003–2015, N74: 2008–present)

Models Fitted (BMW only)

Cross-Brand Fitment

Also fitted to Rolls-Royce (Ghost, Phantom, Cullinan, Dawn, Wraith)

Overall Engine Score

[Score]/100/

★★★★☆

Verdict & Rating

Rating:

3.5

out of 5

85% – based on specialist reports and UK owner surveys.

The N73/N74 V12 is a magnificent engine -but running costs are eye-watering and repairs are specialist-only -buy only with deep pockets and a warranty.

Best for:

Luxury car buyers who value effortless torque and refinement above all else.

Avoid if:

You're on a budget, or don't have access to a specialist who knows V12 BMWs.

Engine Score breakdown:

DimensionScore (of 20)

Reliability

Star rating (3.5★) × 4 = 14

14 /20

Repair Cost

Reconditioned supply midpoint ~£7,000–£10,000 → 8 (£7,000–£9,999 bracket)

8 /20

Repairability

V12 complexity makes most repairs labour-intensive; limited specialist pool

8 /20

Parts Supply

Parts are available but often dealer-only or import-dependent; aftermarket support is limited

8 /20

Replacement Economics

Recon cost ~60–74% of lowest typical value (older E65 760i) → 8

8 /20

Total Engine Score

46 / 100

Rating:

3.5

out of 5

85% – based on specialist reports and UK owner surveys.

The N73/N74 V12 is a magnificent engine -but running costs are eye-watering and repairs are specialist-only -buy only with deep pockets and a warranty.

Engine Score breakdown:

DimensionScore (of 20)

Reliability

Star rating (3.5★) × 4 = 14

14 /20

Repair Cost

Reconditioned supply midpoint ~£7,000–£10,000 → 8 (£7,000–£9,999 bracket)

8 /20

Repairability

V12 complexity makes most repairs labour-intensive; limited specialist pool

8 /20

Parts Supply

Parts are available but often dealer-only or import-dependent; aftermarket support is limited

8 /20

Replacement Economics

Recon cost ~60–74% of lowest typical value (older E65 760i) → 8

8 /20

Total Engine Score

46 / 100

Best for:

Luxury car buyers who value effortless torque and refinement above all else.

Avoid if:

You're on a budget, or don't have access to a specialist who knows V12 BMWs.

Compatible BMW Models

BMW N73 / N74 engines are fitted across 0+ models from 2003–2015.

BMW Exclusive Engine

This is an exclusive BMW engine. No cross-platform sharing.

2003

12 Years of Production

2015

Other BMW Models

N73 / N74 also appears in limited variants and markets.

View full details →

Compatibility Verified

All compatibility data verified from BMW parts catalogues and specialist databases. [BMW-VERIFIED]

Other BMW Models

N73 / N74 also appears in limited variants and markets.

View full details ›

Compatibility Verified

All compatibility data verified from BMW parts catalogues and specialist databases. [BMW-VERIFIED]

Also powers the Rolls-Royce Ghost, Phantom, Cullinan, Dawn, and Wraith – the N74 is the foundation of Rolls-Royce's modern V12 line-up.

BMW N73 / N74 Engine Price Guide

All prices are estimates from UK specialists [BMW-QUOTE]

Fitting an N73/N74 typically takes 18–24 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [ESTIMATED].

The N74 is used in both BMW and Rolls-Royce applications – parts are identical, though Rolls-Royce-specific tuning and ancillaries may add cost.

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BMW N73 / N74 Engine Price Guide

All prices are estimates from UK specialists

[BMW-QUOTE]

Fitting an N73/N74 typically takes 18–24 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [ESTIMATED].

The N74 is used in both BMW and Rolls-Royce applications – parts are identical, though Rolls-Royce-specific tuning and ancillaries may add cost.

Compare BMW N73 / N74 engine prices from UK specialists

Frequently Asked Questions

Expert answers to the most common BMW N73 / N74 engine questions.

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