How much does an OM646/OM647 engine replacement cost?

A reconditioned OM646 or OM647 typically costs £2,000–£3,500 supply only, varying by specific variant and application. Fitting adds £800–£1,200 depending on labour rates. Use our calculator for a figure specific to your car.

Is the Mercedes OM646/OM647 a reliable engine?

The OM646 and OM647 are rated 3.5★ out of 5 — they are widely regarded as durable, high-mileage workhorses. The OM646 in particular is known for exceptional longevity, with examples exceeding 500,000 km. However, injector seal leaks ('Black Death') and turbocharger wear are well-documented from around 100,000 miles.

What is the most common OM646/OM647 failure?

The most common issue is injector seal failure — the copper washer between the injector and cylinder head fails, allowing combustion gases to escape, causing carbon buildup ('Black Death'). Turbocharger wear from oil residue in the charge air system is also common from 150,000–180,000 km.

Which Mercedes models use the OM646 and OM647?

The OM646 powered C-Class (W203/W204), E-Class (W211), CLK (C209), Sprinter, Viano and Vito as 200 CDI and 220 CDI models. The OM647 — a 2.7-litre five-cylinder — was fitted to E 270 CDI, ML 270 CDI, G 270 CDI, and S 270 CDI models.

How long does the OM646/OM647 last?

With proper maintenance — regular oil changes, injector seal inspections, and DPF-friendly driving — both engines are capable of 200,000–500,000 miles. The OM646 is considered one of Mercedes' most durable diesel four-cylinders.

Mercedes-BenzOM646/OM647DieselInline-4 / Inline-52002–2010

Mercedes-Benz OM646/OM647 Engine – Specs, Reliability & Replacement Cost

The Mercedes OM646 and OM647 are durable 2.1-litre four-cylinder and 2.7-litre five-cylinder diesels – robust workhorses, but injector seal leaks and turbo wear are well-documented. Backed by real UK enquiries from EnginesMarket.co.uk.

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Mercedes-Benz OM646/OM647 Engine – Specs, Reliability & Replacement Cost

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Enquiry Data Available
25+
Models
Fitted
78/100
Engine
Score
Part of Engine Finders

Jaguar Mercedes-Benz OM646 / OM647 Engine Overview

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

Engine Family

Mercedes-Benz OM646 / OM647

Fuel

Diesel

Power Range

88–177 hp

Overall Engine Score

78/100

★★★★☆

Configuration / Displacement

Inline-4, 2.1L (OM646) / Inline-5, 2.7L (OM647)

Modern turbodiesel four-cylinder engine with proven architecture.

Years Produced

2002–2010

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

Exclusive to Mercedes-Benz

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

Mercedes-Benz OM646 / OM647

Fuel

Diesel

Configuration /
Displacement

Inline-4, 2.1L (OM646) / Inline-5, 2.7L (OM647)

Power Range

88–177 hp

Years Produced

2002–2010

Models Fitted (BMW only)

Cross-Brand Fitment

Exclusive to Mercedes-Benz

Overall Engine Score

78/100

★★★★☆

Verdict & Rating

Rating:

3.5

out of 5

85% confidence – based on verified specialist rebuild reports and UK workshop consensus.

The OM646 and OM647 are rugged, high-mileage diesels when maintained – but 'Black Death' injector seal leaks and turbo wear are common past 100,000 miles – buy only with documented service history.

Best for:

Buyers wanting a durable, economical Mercedes diesel with proven commercial-grade longevity.

Avoid if:

You're looking at a high-mileage example with no injector seal or turbo service records.

Engine Score breakdown:

DimensionScore (of 20)

Reliability

3.5★ × 4

14 /20

Repair Cost

Reconditioned supply midpoint £3,000–£4,999

16 /20

Repairability

Mostly cheap, well-understood repairs (injector seals, EGR, turbo)

16 /20

Parts Supply

Available but specialist-order only; Mercedes parts premium applies

16 /20

Replacement Economics

Recon cost 30–44% of lowest host-vehicle value

16 /20

Total Engine Score

78 / 100

Rating:

3.5

out of 5

85% confidence – based on verified specialist rebuild reports and UK workshop consensus.

The OM646 and OM647 are rugged, high-mileage diesels when maintained – but 'Black Death' injector seal leaks and turbo wear are common past 100,000 miles – buy only with documented service history.

Engine Score breakdown:

DimensionScore (of 20)

Reliability

3.5★ × 4

14 /20

Repair Cost

Reconditioned supply midpoint £3,000–£4,999

16 /20

Repairability

Mostly cheap, well-understood repairs (injector seals, EGR, turbo)

16 /20

Parts Supply

Available but specialist-order only; Mercedes parts premium applies

16 /20

Replacement Economics

Recon cost 30–44% of lowest host-vehicle value

16 /20

Total Engine Score

78 / 100

Best for:

Buyers wanting a durable, economical Mercedes diesel with proven commercial-grade longevity.

Avoid if:

You're looking at a high-mileage example with no injector seal or turbo service records.

Compatible Jaguar Models

Jaguar Engine engines are fitted across 9+ models from 2002–2010.

Jaguar Exclusive Engine

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

2002

8 Years of Production

2010

C-Class

W203 · W204

C 200 CDI / C 220 CDI

2002–20101 Variants →

E-Class

W211

E 200 CDI / E 220 CDI · E 270 CDI (OM647)

2002–20092 Variants →

CLK-Class

C209

CLK 220 CDI

2002–20091 Variants →

S-Class

W220

S 270 CDI (OM647)

2002–20051 Variants →

M-Class

W163

ML 270 CDI (OM647)

2002–20051 Variants →

G-Class

W463

G 270 CDI (OM647)

2002–20061 Variants →

Sprinter

W901–W906

211 CDI / 311 CDI / 411 CDI

2002–20101 Variants →

Viano

/ Vito

W639

Viano 2.2 CDI / Vito 111/115/119 CDI

2003–20101 Variants →

V-Class

W638

V 220 CDI

2002–20031 Variants →

+

Other Jaguar Models

Engine also appears in limited variants and markets.

View full details →

Compatibility Verified

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

C-Class

Generation

W203

Variant/Badge

C 200 CDI / C 220 CDI

Years

2002–2007

C-Class

Generation

W204

Variant/Badge

C 200 CDI / C 220 CDI

Years

2007–2010

E-Class

Generation

W211

Variant/Badge

E 200 CDI / E 220 CDI

Years

2002–2009

E-Class

Generation

W211

Variant/Badge

E 270 CDI (OM647)

Years

2002–2005

CLK-Class

Generation

C209

Variant/Badge

CLK 220 CDI

Years

2002–2009

S-Class

Generation

W220

Variant/Badge

S 270 CDI (OM647)

Years

2002–2005

M-Class

Generation

W163

Variant/Badge

ML 270 CDI (OM647)

Years

2002–2005

G-Class

Generation

W463

Variant/Badge

G 270 CDI (OM647)

Years

2002–2006

Sprinter

Generation

W901–W906

Variant/Badge

211 CDI / 311 CDI / 411 CDI

Years

2002–2010

Viano

/ Vito

Generation

W639

Variant/Badge

Viano 2.2 CDI / Vito 111/115/119 CDI

Years

2003–2010

V-Class

Generation

W638

Variant/Badge

V 220 CDI

Years

2002–2003

+

Other Jaguar Models

Engine also appears in limited variants and markets.

View full details ›

Compatibility Verified

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

(Exclusive mode – no cross-link)

Jaguar Engine Engine Price Guide

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

i

Fitting an OM646 or OM647 typically takes 8–12 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

(Exclusive mode – no cross-link)

USED

Supply Only

£800–£1,800

Fitted (Indie)

£1,400–£2,600

3–6 months

Jaguar Engine Engine Price Guide

All prices are estimates from UK specialists

[JAGUAR-QUOTE]

USED

Supply Only

£800–£1,800

Fitted (Indie)

£1,400–£2,600

Warranty

3–6 months

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