Engines Market

Mercedes Benz G 350 d Specialists

Mercedes Benz G Class G 350 d Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz G Class G 350 d engine specialists. Compare prices on reconditioned, rebuilt and used OM642 diesel engines - supply & fit available nationwide.

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Mercedes Benz G Class G 350 d Engine
from£4,800 to £7,500
  • Usedfrom £2,500
  • Reconditionedfrom £4,200
  • Common codesOM642.887, OM642.886, OM642 LS
Mercedes Benz g-class G 350 d Used Engine — OM642.887Mercedes Benz g-classUsed Engine — OM642.887Mercedes Benz g-class G 350 d Reconditioned Engine — OM642.887Mercedes Benz g-classReconditioned Engine — OM642.887Mercedes Benz g-class G 350 d Rebuilt Engine — OM642.887Mercedes Benz g-classRebuilt Engine — OM642.887

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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 G Class G 350 d Engine History & Specs at a Glance

The Mercedes Benz G 350 d arrived in 2015 as the facelifted W463 generation's updated diesel flagship, replacing the G 350 CDI with a more powerful iteration of the OM642 V6 diesel - and later transitioned to the W464 generation with the same engine before being phased out in favour of the OM656 inline-six in the G 400 d.

Mercedes Benz G Class G 350 d
  1. 2015

    G 350 d introduced with W463 facelift, OM642.887 3.0L V6 diesel, 245hp, Euro 6 emissions compliance

  2. 2015

    2018 - W463 G 350 d production, 7G-TRONIC PLUS automatic transmission, 600Nm torque

  3. 2018

    W464 all-new G-Class launched, G 350 d continues with OM642 V6 diesel in the new platform

  4. 2019

    2023 - W464 G 350 d production continues with OM642, later phased out as G 400 d (OM656 inline-six) became the primary diesel offering

Every OM642 engine fitted to the Mercedes Benz G Class G 350 d is covered below, with UK rebuilt pricing and known failure points from real owner experience.

Engine Codes & Pricing

Mercedes Benz G Class G 350 d Engine Codes Specifications & Replacement Cost

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

OM642.887 — 3.0L V6 Diesel (2015-2018) engine

OM642.887 — 3.0L V6 Diesel (2015-2018)

Power Output
245 hp @ 3,600rpm
Torque
600Nm @ 1,600-2,400rpm
Years Fitted
2015-2018

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Common Problems

Mercedes Benz G Class G 350 d Engine Problems Repair Cost vs Replacement

The Mercedes Benz G Class G 350 d relies on the OM642 V6 diesel - a generally robust engine that has developed a well-documented reputation for specific failures. The oil cooler seal issue dominates replacement demand, while EGR cooler and turbocharger-related problems also drive repair enquiries. 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 G 350 d 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 Benz G Class G 350 d (OM642.887, OM642 LS, 2015-2023)
Typical failure mileage
60,000 - 90,000 miles
Root cause
The factory rubber oil cooler seals harden and shrink due to heat cycling, allowing oil to mix with coolant and external oil leaks to form at the V-angle of the engine. Mercedes Service Bulletin LI18.30-P-055434 addresses this known issue.

Repair options

Repair tierDealer priceSpecialist price
Minor - Seal Replacement£1,800-£2,500£900-£1,400
Intermediate - Oil Cooler & Seal Assembly£2,500-£3,500£1,400-£2,000
Full Replacement - Rebuilt Engine£8,000-£12,000£4,800-£7,500
Our recommendation
If caught early with only external weeping, the seal-only specialist fix at £900-£1,400 is excellent value and should last 60k+ miles with revised seals. However, if the leak has caused coolant contamination or the engine has overheated, we recommend the full rebuilt route - contaminated oil galleries often cause turbo or bearing failure within 10k-15k miles of a partial repair.
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OM642 EGR Cooler Failure

Affected
Mercedes Benz G Class G 350 d (OM642.887, OM642 LS, 2015-2023)
Typical failure mileage
80,000 - 120,000 miles
Root cause
The EGR cooler can crack internally, allowing coolant to leak into the exhaust system - triggering low coolant warnings, white smoke, and emissions-related fault codes. Carbon buildup also causes the EGR valve to stick open or closed.

Repair options

Repair tierDealer priceSpecialist price
Minor - EGR Valve Cleaning£300-£500£150-£300
Major - EGR Cooler Replacement£1,200-£1,800£700-£1,100
Full Replacement - Rebuilt Engine£8,000-£12,000£4,800-£7,500
Our recommendation
On a G 350 d with 80k+ miles, we recommend having the EGR system inspected during any major service. If the cooler is leaking, specialist replacement at £700-£1,100 is the right call - don't ignore coolant loss, as it can lead to overheating and more extensive engine damage.
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OM642 Turbocharger & Timing Chain Wear

Affected
Mercedes Benz G Class G 350 d (OM642.887, OM642 LS, 2015-2023)
Typical failure mileage
120,000 - 180,000 miles
Root cause
The variable geometry turbocharger can suffer from sticking vanes due to carbon buildup, while the timing chain can stretch on very high-mileage units - though the later single-row chain fitted from 2015 is considerably more durable than earlier dual-row versions.

Repair options

Repair tierDealer priceSpecialist price
Minor - Turbo VNT Cleaning£400-£700£250-£500
Major - Turbocharger Replacement£2,000-£3,000£1,200-£1,800
Full Replacement - Rebuilt Engine£8,000-£12,000£4,800-£7,500
Our recommendation
The OM642's timing chain is not a major concern on post-2015 G 350 d models - as one specialist notes, "unless you intend to drive it past 200K miles, I wouldn't worry about it." For turbo issues, start with VNT cleaning before committing to a full replacement - many sticking vane problems can be resolved without removing the turbo.
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Don't Let Engine Failure Write Off Your Mercedes Benz G Class G 350 d

A failed engine doesn't have to mean the end of your G 350 d. Whether you're dealing with an OM642 oil cooler seal leak, EGR cooler failure, or turbocharger issues, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Benz G Class 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 Benz G Class G 350 d Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz G Class G 350 d owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

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Comparing quotes for your Mercedes Benz G Class G 350 d 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 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+ G 350 d engines supplied through our network
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