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Mercedes Benz G Class Engine ReplacementCompare Prices & Save

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

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G Class Diesel Engines - from £4,995 to £9,500

-> Rebuilt units from £4,995 · Common codes: OM642.DE30.LA, OM642.LS, OM656, OM603

G Class Petrol Engines - from £5,500 to £12,000

-> Rebuilt units from £5,500 · Common codes: M176, M177, M113, M117

G Class AMG Engines - from £7,500 to £25,000

-> Rebuilt units from £7,500 · Common codes: M157, M177 (G63), M279 (G65)

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3 Simple Stepsto Finding the Best Mercedes Benz G Class Replacement Engine

Get Instant Quotes from Mercedes - Benz Engine Specialists Across the UK - 100% free, no obligation. Most replacements completed within 3-5 days.

Most replacements completed within 3-5 days.

12-Month Warranty
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Live UK Engine Market Data

What Are UK Drivers Paying for Mercedes Benz G Class Engine Replacement?

The table below shows typical UK rebuilt engine replacement costs across different Mercedes Benz G Class variants, covering known failure causes, engine codes, fuel types and engine sizes.

Mercedes Benz G Class live market price reference
Average Market Prices
  • Mercedes Benz G Class (W463A) G 400 d2019-2023£5,500-£8,500
    Coolant pump leak
    OM656Diesel 3.0L
  • Mercedes Benz G Class (W463A) G 63 AMG2018-2024£8,500-£15,000
    Top timing chain wear
    M177Petrol 4.0L
  • Mercedes Benz G Class (W463A) G 450 d2024-present£6,000-£9,000
    AdBlue system failure
    OM656MHEV Diesel 3.0L
  • Mercedes Benz G Class (W463A) G 65 AMG2015-2018£15,000-£25,000
    Turbocharger bearing wear
    M279Petrol 6.0L
  • Mercedes Benz G Class (W463) G 300 GD1990-1993£3,500-£5,500
    Injector pump failure
    OM603Diesel 3.0L
  • Mercedes Benz G Class (W463) G 5001998-2008£4,200-£6,800
    Timing chain wear
    M113Petrol 5.0L
  • Mercedes Benz G Class (W463) G 55 AMG2004-2012£5,500-£9,000
    Supercharger clutch failure
    M113KPetrol 5.4L
  • Mercedes Benz G Class (W463) G 350 CDI2007-2015£4,500-£7,200
    Oil cooler seal leak
    OM642Diesel 3.0L
  • Mercedes Benz G Class (W463) G 63 AMG2012-2018£7,500-£12,000
    Turbo actuator failure
    M157Petrol 5.5L
  • Mercedes Benz G Class (W463) G 350 d2015-2018£4,800-£7,500
    EGR valve failure
    OM642Diesel 3.0L
  • Mercedes Benz G Class (W463) G 5002015-2018£5,500-£8,500
    Cylinder deactivation issue
    M176Petrol 4.0L
  • Mercedes Benz G Class (W463A) G 350 d2018-2023£5,200-£8,000
    DPF regeneration failure
    OM642Diesel 3.0L
  • Mercedes Benz G Class (W463A) G 5002018-2024£6,000-£9,500
    High pressure fuel pump
    M176Petrol 4.0L
Last updated: 22 May, 14:59

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Models We Cover

Mercedes Benz G Class Engine ReplacementAll Variants Covered

From the rugged G 350 d to the ferocious G 63 AMG, our network of UK Mercedes Benz G Class engine specialists helps you compare rebuilt, reconditioned and used engine prices. Typical range for a rebuilt unit with 24-month warranty is £4,500-£25,000 - supply & fit available nationwide.

Core Diesel Range

Specs245hp
Years2015-2023
Rebuilt£4,800-£7,500
Compare G 350 d Engine Prices

Core Petrol Range

Performance & AMG Range

Variant Directory

Diesel Variants

G 240 GDG 250 GDG 280 CDIG 300 CDIG 300 GDG 320 CDIG 350 BlueTECG 350 CDIG 350 dG 350 d ProfessionalG 400 CDIG 400 dG 400 d ProfessionalG 450 d

Petrol Variants

G 230 GEG 240 GEG 280 GEG 300 GEG 320G 320 GEG 350G 500G 500 AMG LineG 500 ClassicG 500 Designo Edition

Performance Variants

G 500 Final EditionG 55 AMGG 55 AMG KompressorG 55 AMG MagnaG 63 AMGG 63 AMG 6x6G 63 AMG Edition 463G 63 AMG Grand EditionG 65 AMGG 65 AMG Final EditionNot sure which variant your Mercedes Benz G Class is? Enter your registration number above - we'll identify the exact sub-model, engine code and compatible replacement options instantly.
Engine Codes

Mercedes Benz G Class Engine CodesFull Technical Specifications & Replacement Guide

Every engine code fitted to the Mercedes Benz G Class across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.

Diesel Engines

Extracted from detailed diesel engine families across Mercedes Benz G Class variants.

Petrol Engines

Extracted from detailed petrol and performance engine families across Mercedes Benz G Class variants.

Can't find your engine code?

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Common Problems

Mercedes Benz G Class Engine Problems
What It Costs to Fix & When Replacement Makes Sense

Affected Models

Mercedes Benz G Class G 320 CDI, G 350 CDI, G 350 d (2006-2023, OM642 DE30 LA & OM642 LS)

Typical Failure Mileage

60,000 - 90,000 miles

Root Cause

Minor - Seal Replacement
Dealer
£1,800 - £2,500
Specialist
£900 - £1,400

Replace oil cooler seals (A6421800003 revised part), flush cooling system, new oil and filter

60k-80k miles if using revised Viton seals
Intermediate - Oil Cooler & Seal Assembly
Dealer
£2,500 - £3,500
Specialist
£1,400 - £2,000

Replace complete oil cooler unit with revised seals, coolant flush, thermostat inspection

80k-100k miles; recommended if cooler shows corrosion
Full Replacement - Rebuilt Engine
Dealer
£7,500 - £10,000
Specialist
£4,800 - £7,500

Supply & fit rebuilt OM642 with upgraded seals, new oil pump chain, turbo inspected

100k+ miles with extended warranty cover
Our Recommendation
Best next step for om642 oil cooler seal failure

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.

Compare rebuilt OM642 engine prices for your Mercedes Benz G Class

Don't Let Engine Failure Write Off Your Mercedes Benz G Class

A failed engine doesn't have to mean the end of your G Class. Whether you're dealing with an OM642 oil leak, an AMG turbo actuator failure, or a classic OM603 timing chain issue, 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.

Compare Mercedes Benz G Class Engine Replacement Prices Now →

Disclaimer: All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Mercedes Benz G Class and engine code. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.

12-Month Warranty
Upgraded Components
Nationwide UK Delivery
Save vs Main Dealer Price
Replacement Engine Options

Mercedes Benz G Class Engine TypesOptions, Costs & What to Expect

Every engine type for your Mercedes Benz G Class is available through our UK network, with typical price ranges based on variant, engine code and budget.

Reconditioned
Mercedes Benz G Class Reconditioned Engines (Recon)

Factory-spec engine strip-down, inspection and component replacement using OEM or OEM-quality parts. Returns engine to measured tolerances.

Typical price range
£4,500 - £9,500
(supply only)
Best balance of cost and long-term durability for most G Class owners.
Compare reconditioned Mercedes Benz G Class engine prices
Reconditioned

Industry-recognised "recon" process strips every component to the bare block. Failed parts (pistons, rings, bearings, seals) are replaced with OEM-spec items.

  • Dimensional inspection ensures factory-correct tolerances
  • OM642/M176/M177 codes fully warrantied for 24 months
  • Ideal for G Class owners keeping their vehicle 3+ years
Rebuilt
Mercedes Benz G Class Rebuilt Engines

Engine disassembled, inspected and fitted with new piston rings, bearings, gaskets and seals. Worn parts replaced as needed.

Typical price range
£3,800 - £8,500
(supply only)
Quality varies by specialist - use only EngineMarket-vetted suppliers.
Get rebuilt Mercedes Benz G Class engine quotes
Rebuilt

A "rebuild" focuses on bringing the engine back to reliable service without full remanufacturing standards. Excellent value for older or higher-mileage G Class models.

  • Shorter turnaround than recon at 5-10 working days
  • All OM603, OM606 and M113 classics covered
  • 12-month warranty standard on all rebuilds
Used
Mercedes Benz G Class Used Engines

Low-mileage take-off engine salvaged from a donor G Class. Sold exactly as removed - no internal work performed.

Typical price range
£2,000 - £5,500
(supply only)
Fastest option but highest risk - verify mileage and compression reports.
Check used Mercedes Benz G Class engine availability
Used

Budget-conscious choice for G Class owners with tight timelines. Typically removed from rear-end or side-impact donor vehicles with verifiable mileage and service history.

  • 48-hour delivery possible for common OM642 units
  • Compression test reports available on request
  • Best for short-term ownership (under 2 years)
Remanufactured
Mercedes Benz G Class Remanufactured Engines

Full factory-certified zero-mile rebuild. Every component machined to new tolerances with complete replacement of wear items and electronics.

Typical price range
£6,500 - £15,000
(supply only)
Premium choice - closest you can get to a brand-new Mercedes Benz engine.
Compare remanufactured Mercedes Benz G Class engine costs
Remanufactured

The gold standard for G Class preservation. Each reman unit is stripped to bare metal, ultrasonically cleaned, and reassembled with 100% new critical components.

  • All OM656, M177 and M279 units hot-tested before shipping
  • Unlimited mileage warranty up to 36 months
  • Includes new timing chains, oil pumps and turbochargers
Refurbished
Mercedes Benz G Class Refurbished Engines

Cosmetic and mechanical "tidy-up" of a used engine. Gaskets, seals and external components replaced - internal rotating parts untouched.

Typical price range
£2,800 - £6,000
(supply only)
Entry-level option - understand the limitations before purchase.
View refurbished Mercedes Benz G Class engine options
Refurbished

Refurbished sits between used and rebuilt. The engine receives new external seals, a fresh cambelt/chain where accessible, and a thorough clean for visual presentation.

  • 1-2 day turnaround for common G Class codes
  • No internal bearing or ring replacement
  • Suitable for low-mileage G 350 d with external leaks only
Supply & Fit
Mercedes Benz G Class Supply & Fit Engines

Fully managed service - we connect you with a specialist who supplies the engine and completes professional installation at their workshop.

Typical price range
£800 - £1,500 added to engine price
Eliminates garage-finding hassle - fitted by accredited G Class specialists.
Find Mercedes Benz G Class engine supply & fit deals
Supply & Fit

The complete turnkey solution for owners without a trusted mechanic. EngineMarket matches your G Class to an accredited specialist who handles supply, delivery and fitting as one package. All engine types include a minimum 12-month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Mercedes Benz G Class within hours.

  • Includes all gaskets, fluids and sundries in fitting cost
  • 3-5 day typical workshop turnaround for OM642 units
  • Single invoice, single point of warranty contact

All engine types include a minimum 12-month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Mercedes Benz G Class within hours.

Engine Sizes

Mercedes Benz G Class Engines by SizeFind the Right Displacement for Your Variant

Every displacement fitted to the Mercedes Benz G Class across all generations is listed below, with compatible engine codes, production years and common failure notes.

Mercedes Benz G Class Diesel Engine Sizes

The 2.9-litre inline-six diesel arrived with the W463A generation G Class in 2019, replacing the long-serving OM642 V6. Codenamed OM656, this all-alloy unit introduced CAMTRONIC variable valve lift on the exhaust side and a two-stage turbocharger system producing exceptional 700Nm torque delivery from just 1,200rpm . Available initially as the G 400 d, the 2.9L later expanded to G 450 d variants, offering the most powerful diesel ever fitted to a G Class with 243kW output while maintaining refinement that eliminates traditional diesel clatter .

Engine Code(s)OM656 D29, OM656
Compatible Models (UK)G 400 d (2019-present), G 450 d
Production Years2024-present
Common Failure Points
Watch for these known weak points

CAMTRONIC actuator seizure (A6560500001), coolant pump seal failure, AdBlue dosing module crystallisation on urban-driven vehicles

Get quotes for Mercedes Benz G Class 2.9L diesel engines

Mercedes Benz G Class Engines Fuel Type

Mercedes Benz G Class Engines by Fuel Type

Mercedes Benz G Class Diesel Engines
Mercedes Benz G Class Diesel Engines

The backbone of UK G Class sales since the W463 generation, diesel engines dominate replacement enquiries - particularly the OM642 V6 which powers approximately 70% of diesel models on British roads.

Common Engine Families
OM642 - 3.0L V6, the most searched replacement engine (G 320 CDI, G 350 CDI, G 350 d), oil cooler seal failure risk
OM656 - 3.0L inline-6, current-generation diesel (G 400 d, G 450 d), CAMTRONIC actuator and AdBlue issues
OM603 - 3.0L naturally aspirated inline-6, classic G 300 GD, legendary durability but injector pump calibration drift
OM606 - 3.0L turbodiesel inline-6, G 300 Turbodiesel (1996-2000), highly sought after for restoration projects
OM617 - 3.0L inline-5, original G Class diesel (W460/W461), military-grade simplicity but head gasket failure common
Found In
W460/W461 (1979-1990) - OM617 (G 300 GD military/civilian)
W463 Early (1990-2006) - OM603 (G 300 GD), OM606 (G 300 Turbodiesel)
W463 Facelift (2006-2018) - OM642 (G 320 CDI, G 350 CDI, G 350 d)
W463A (2018-present) - OM642 (early G 350 d), OM656 (G 400 d, G 450 d)
Known For
Exceptional low-range torque suited to G Class off-road capability
OM642 oil cooler seal failure affecting ~80% of units over 60k miles
High replacement demand on G 350 d (most common UK fleet variant)
OM656 CAMTRONIC and AdBlue crystallisation issues on urban-driven vehicles
OM603/OM606 timing chain stretch requiring preventative replacement at 120k-150k miles

Not sure which fuel type your Mercedes Benz G Class has? Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK Mercedes Benz G Class specialists.

Engine Years

Mercedes Benz G Class Engines by YearWhat Was Fitted & When

From the 1979 W460 military-spec original to the 2024 electrified W465 generation, this timeline covers every major engine fitted to the Mercedes-Benz G-Class - helping you identify your exact unit and compare rebuilt prices from UK specialists.

1979 - 1989 - W460/W461 Original Launch
Major Platform Change
The G-Class (Geländewagen) launched as a military-inspired off-roader with modest inline engines - a far cry from today's AMG monsters.
Key Changes
W460 launch with short-wheelbase (SWB) cabrio, SWB station wagon, long-wheelbase (LWB) station wagon body styles
230 G (2.3L petrol) and 240 GD (2.4L diesel) as initial UK options
Military-spec W461 continued alongside civilian W460 from mid-1980s
Solid axles, ladder-frame chassis and three differential locks established
Known For
Built for military durability, not luxury or speed
OM617 diesel regularly exceeds 300,000 miles with basic maintenance
Slow, noisy, but virtually unbreakable
300 GD remains highly sought after for classic restoration projects
Main Engines
M115 - 2.0L petrol (200 G) - entry-level
M115 - 2.3L petrol (230 G) - most common early petrol
OM616 - 2.4L diesel (240 GD) - four-cylinder workhorse
OM617 - 3.0L diesel (300 GD) - five-cylinder, legendary durability
Engine Codes Covered
M115OM616OM617
Popular Models
Mercedes-Benz 230 G · Mercedes-Benz 240 GD · Mercedes-Benz 300 GD
Common Replacement Enquiries
Get quotes for 1979-1989 Mercedes-Benz G-Class replacement engines
Year Finder
Not sure which year your Mercedes Benz G Class was built?

Not sure which year your Mercedes-Benz G-Class was built? Enter your registration number and we'll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12-month warranty from UK Mercedes-Benz G-Class specialists.

FAQ

Mercedes Benz G Class Engine ReplacementFrequently Asked Questions

Question 1

How much does it cost to replace a Mercedes G Class engine in the UK?

A Mercedes G Class engine replacement typically costs between £4,500 and £15,000 depending on engine code, condition type, and whether fitting is included. OM642 diesels start around £4,800, while G63 AMG units range from £8,500 to £15,000.

Key points

  • Reconditioned OM642 (G350d): £4,800-£7,500 supply only
  • Rebuilt M157 (G63 AMG 2012-2018): £7,500-£12,000 supply only
  • Used engines from breakers: £2,000-£5,500 but higher risk
  • Labour for supply & fit adds £800-£1,500 to any engine price
Compare Mercedes G Class engine replacement prices from UK specialists

Question 2

Is the OM642 diesel engine in the G Class reliable?

The OM642 is generally robust but has a known weak point - the oil cooler seals fail on ~80% of units after 60,000 miles, causing oil and coolant to mix. Address this preventatively and the engine easily exceeds 150,000 miles.

Key points

  • Oil cooler seal failure is the most common G350d issue
  • Turbocharger carrier bolts can fail, causing oil leaks
  • EGR cooler cracking affects earlier OM642 variants
  • With revised seals, 150k+ miles is realistic
Get quotes for OM642 Mercedes G Class replacement engines

Question 3

What is the most common G63 AMG engine problem?

The M157 (2012-2018) and M177 (2018-present) turbo actuators fail between 45,000-70,000 miles, causing limp mode and power loss. The M157 actuator (A1570940001) is the most frequent AMG G-Class failure driving replacement enquiries.

Key points

  • Turbo actuator failure triggers limp mode and check engine light
  • Exhaust manifold cracking on hot-V M177/M176 engines
  • M157 valve guide wear documented on low-mileage AMG units
  • Top timing chain tensioner wear on M177 G63 models
Find reconditioned M157 or M177 Mercedes G Class engines

Question 4

Which G Class engine should I avoid when buying used?

No engine is fundamentally flawed, but high-mileage M157 (pre-2015) without documented turbo actuator replacement carries risk, and pre-2015 OM642 without oil cooler seal history needs immediate attention. Post-2018 OM656 diesel is the most reliable modern choice.

Key points

  • Early M157 (2012-2014) has highest actuator failure rate
  • OM642 needs oil cooler seals done every 60k-80k miles
  • OM656 (G400d) has fewer reported failures than OM642
  • M113 V8 (pre-2008) is simple and durable but thirsty
Compare Mercedes G Class engine prices by variant

Question 5

How long does a Mercedes G Class engine last?

A well-maintained G Class diesel engine regularly reaches 200,000-300,000 miles, with OM603/OM606 classics exceeding 300k. Petrol V8s typically last 150,000-200,000 miles before needing major work. The chassis itself can outlast multiple engines.

Key points

  • OM606 turbodiesel (1996-2001) is legendary for 300k+ mile longevity
  • OM642 needs oil cooler seals every 60k-80k to reach 200k
  • M113 V8s commonly reach 150k-200k with timing chain attention
  • Modern OM656 (G400d) too new for longevity data but promising
Get quotes for long-lasting rebuilt Mercedes G Class engines

Question 6

Should I repair or replace my G Class engine?

Repair if the failure is isolated (e.g., oil cooler seals, turbo actuator, timing chain tensioner). Replace if there's bottom end damage, bore scoring, or multiple major failures. For G Classes worth £25,000+, a specialist rebuilt engine often makes more financial sense than chasing partial repairs.

Key points

  • Oil cooler seal replacement at specialist: £900-£1,400 - excellent value
  • M157 turbo actuator replacement: £600-£950 - do this first
  • Full OM642 rebuild: £4,800-£7,500 - for catastrophic failure or 150k+ miles
  • G63 AMG full rebuild: £8,500-£15,000 - still less than new vehicle depreciation
Compare Mercedes G Class engine repair vs replacement costs

Question 7

What is the most fuel-efficient G Class engine?

The OM656 3.0L straight-six diesel in the G400d returns approximately 11.9L/100km (24 mpg UK) in mixed driving - remarkably efficient for a 2.5-tonne brick-shaped SUV. The G63 AMG V8 averages just 13-14 mpg.

Key points

  • G400d (OM656) returns ~24 mpg with 700Nm torque
  • G350d (OM642) returns ~22-23 mpg
  • G500 V8 petrol returns ~15-18 mpg
  • G63 AMG V8 returns ~13-14 mpg
Get quotes for Mercedes G Class diesel replacement engines

Question 8

How do I know which engine code my G Class has?

Check your vehicle log book (V5C) for the engine number, which includes the engine code prefix (e.g., OM642, M176). Alternatively, enter your registration number in our tool above - we pull exact engine data from DVLA records instantly.

Key points

  • V5C log book shows full engine number with code prefix
  • Engine code stamped on cylinder block (visible from under vehicle)
  • Service history documents list engine type
  • Our DVLA tool identifies engine in 10 seconds
Find your Mercedes G Class engine code and compare prices

Question 9

Can I fit a used G Class engine myself?

We strongly advise against DIY fitting on a G Class. The complex 4MATIC system, gearbox alignment, and coding requirements demand specialist equipment and expertise. A poorly fitted engine can destroy the transfer case or cause electrical failures costing more than professional fitting.

Key points

  • 4MATIC transfer case alignment requires specialist jigs
  • ECU coding and immobiliser synchronisation needed
  • Engine and gearbox must be separated correctly
  • Specialist supply & fit costs £800-£1,500 - worth every penny
Find Mercedes G Class engine supply & fit deals from accredited specialists

Question 10

What warranty comes with a reconditioned G Class engine?

Every engine supplied through EngineMarket carries a minimum 12-month unlimited mileage warranty, with many specialists offering 24-month coverage on OM642 and AMG rebuilds. This includes parts and labour for any manufacturing defect or installation error.

Key points

  • 12-month unlimited mileage is the minimum standard
  • OM642 and AMG rebuilds often include 24-month warranty
  • All warranties cover parts, labour, and MOT compliance
  • Extended warranties available at point of purchase
Compare Mercedes G Class engines with 24-month warranty coverage

Why Choose Us

Why UK Mercedes Benz G Class Owners Trust EngineMarket

Compare Mercedes Benz G Class engine prices with vetted UK specialists

Compare engine prices for Mercedes Benz G Class in the UK and get competitive quotes from garages near you.

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