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Mercedes Viano 3.0 / 3.5 CDI Specialists

Mercedes Benz Viano 3.0 CDI / 3.5 CDI Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz Viano 3.0 CDI and 3.5 CDI engine specialists. Compare prices on reconditioned, rebuilt and used OM642 V6 diesel engines - supply & fit available nationwide.

Supply & Fit Available
12-Month Warranty
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100+ Suppliers
Mercedes Benz Viano 3.0 CDI / 3.5 CDI Engine
from£2,200 to £3,800
  • Usedfrom £1,200
  • Reconditionedfrom £1,800
  • Common codesOM642.890, OM642.990
Mercedes Benz viano 3.0 CDI / 3.5 CDI Used Engine — OM642.990Mercedes Benz vianoUsed Engine — OM642.990Mercedes Benz viano 3.0 CDI / 3.5 CDI Reconditioned Engine — OM642.990Mercedes Benz vianoReconditioned Engine — OM642.990Mercedes Benz viano 3.0 CDI / 3.5 CDI Rebuilt Engine — OM642.990Mercedes Benz vianoRebuilt Engine — OM642.990

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Mercedes Benz Viano 3.0 CDI / 3.5 CDI Engine History & Specs at a Glance

The Mercedes Benz Viano 3.0 CDI and 3.5 CDI represent the premium diesel options in the W639 Viano range, powered by the OM642 3.0-litre V6 turbodiesel - a smooth, refined engine that delivered 204hp in early models and 224hp in facelift versions, offering superior torque and refinement over the four-cylinder 2.2 CDI units.

Mercedes Benz Viano 3.0 CDI / 3.5 CDI
  1. 2006

    Viano 3.0 CDI introduced with OM642.990 3.0L V6 diesel, 204hp (150kW), 5-speed automatic transmission

  2. 2006

    Marco Polo camper variant offered with same OM642.990 engine

  3. 2010

    W639 facelift introduces upgraded OM642.890 with 224hp (165kW), 440Nm torque, 5G-Tronic or 7G-Tronic transmission

  4. 2014

    Viano production ends, replaced by Mercedes V-Class

Every OM642 V6 diesel engine fitted to the Mercedes Benz Viano 3.0 CDI and 3.5 CDI is covered below, with UK rebuilt pricing and known failure points from real owner experience.

Engine Codes & Pricing

Mercedes Benz Viano 3.0 CDI / 3.5 CDI Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

OM642.990 — 3.0L V6 Diesel (2006-2010) engine

OM642.990 — 3.0L V6 Diesel (2006-2010)

Power Output
204 hp (150 kW) @ 3,800 rpm
Torque
440 Nm
Displacement
2,987cc
Configuration
V6, 72° V-angle, common-rail direct injection, light-alloy block, 4 valves per cylinder
Years Fitted
2006-2010

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Common Problems

Mercedes Benz Viano 3.0 CDI / 3.5 CDI Engine Problems Repair Cost vs Replacement

The Mercedes Viano 3.0 CDI and 3.5 CDI rely on the OM642 V6 diesel - a smooth and refined engine that delivers effortless torque, but has developed a well-documented reputation for specific, expensive failures. Oil cooler seal leakage is the dominant replacement driver, while turbocharger oil seal failure and EGR cooler cracking also feature prominently. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below we break down the most common Viano 3.0 and 3.5 CDI engine failures, what they cost to fix, and when replacement is the smarter financial decision.

Common failure points and repair options

OM642 Oil Cooler Seal Failure

Affected
Mercedes Viano 3.0 CDI, 3.5 CDI (OM642.990, OM642.890, 2006-2014)
Typical failure mileage
70,000 - 150,000 miles
Root cause
The oil cooler seals (A6421880480) sit deep in the "V" of the OM642 V6 engine between cylinder banks. These rubber seals degrade over time, allowing oil to leak down the back of the engine and onto the driveway. The seals themselves cost under £10 - but accessing them requires 8-12 hours of labour. A Mercedes Service Bulletin (LI18.30-P-055434) addresses this known issue.

Repair options

Repair tierDealer priceSpecialist price
Oil Cooler Seal Replacement£1,400-£2,200£800-£1,400
Full Replacement - Rebuilt OM642 Engine£4,000-£6,000£2,200-£3,800
Our recommendation
This is an expensive job for what seems like a minor leak - but it's a known, predictable failure on the OM642. Don't ignore it; oil loss can lead to belt contamination and eventual engine seizure. Use a reputable Mercedes specialist (£800-£1,400) rather than a dealer. If caught early with no engine damage, the seal replacement is the correct fix.
-> Compare rebuilt OM642 engine prices for your Viano 3.0 / 3.5 CDI

OM642 Turbocharger Oil Seal & EGR Cooler Failure

Affected
Mercedes Viano 3.0 CDI, 3.5 CDI (OM642.990, OM642.890, 2006-2014)
Typical failure mileage
60,000 - 120,000 miles
Root cause
The OM642's turbocharger inlet seal can fail, causing oil leaks and potential turbo damage. The EGR cooler can also crack under thermal stress, leading to coolant loss and emissions faults - particularly on urban-driven vehicles. Turbo actuator sticking due to carbon buildup is also common.

Repair options

Repair tierDealer priceSpecialist price
Turbocharger Inlet Seal Replacement£400-£700£250-£450
EGR Cooler Replacement£800-£1,200£500-£800
Full Replacement - Rebuilt OM642 Engine£4,000-£6,000£2,200-£3,800
Our recommendation
If you notice oil leaks from the turbo area or loss of power, have the turbo inlet seal and EGR system inspected immediately. The turbo seal is a relatively inexpensive repair (£250-£450) if caught early. For EGR cooler issues, specialist replacement is significantly cheaper than dealer pricing.
-> Compare rebuilt OM642 Mercedes Viano 3.0 / 3.5 CDI engine prices

OM642 Swirl Flap & Intake Manifold Issues

Affected
Mercedes Viano 3.0 CDI, 3.5 CDI (OM642.990, OM642.890, 2006-2014)
Typical failure mileage
80,000 - 150,000 miles
Root cause
The OM642's intake port shutoff (swirl flap) system can fail, affecting EGR operation and causing loss of power and emissions faults. Carbon buildup in the intake manifold is common on vehicles used primarily for short journeys.

Repair options

Repair tierDealer priceSpecialist price
Intake Manifold Cleaning£500-£800£300-£500
Swirl Flap Actuator Replacement£800-£1,400£500-£900
Full Replacement - Rebuilt OM642 Engine£4,000-£6,000£2,200-£3,800
Our recommendation
The OM642's intake system benefits from regular carbon cleaning, particularly on urban-driven vehicles. If you notice rough idle or loss of power, have the intake manifold and swirl flaps inspected. Specialist cleaning is significantly cheaper than dealer pricing and can restore lost performance.
-> Get quotes for OM642 intake and swirl flap repairs for your Viano 3.0 / 3.5 CDI

Don't Let Engine Failure Write Off Your Mercedes Viano 3.0 or 3.5 CDI

A failed OM642 V6 engine doesn't have to mean the end of your Viano. Whether you're dealing with oil cooler seal failure, turbocharger oil leaks, or EGR cooler issues, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Viano specialists. Every rebuilt engine in our network includes upgraded components designed to address the original failure point, a minimum 12-month unlimited mileage warranty, and nationwide delivery with supply & fit options available.

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FAQ

Mercedes Viano 3.0 CDI / 3.5 CDI Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz Viano 3.0 CDI / 3.5 CDI owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare Mercedes Viano 3.0 / 3.5 CDI V6 Engine Prices Today

Comparing quotes for your Mercedes Viano 3.0 or 3.5 CDI engine replacement is completely free and carries no obligation - enter your registration above, receive tailored prices from UK specialists who know the OM642 V6 diesel engine inside out, and get back on the road with confidence. Every rebuilt engine is backed by a minimum 12-month unlimited mileage warranty.

100+100+ Viano V6 engines supplied through our network
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