How much does a Mercedes W463 engine replacement cost in the UK?

A reconditioned W463 engine typically costs £1,500–£18,000 supply only [MB‑QUOTE], depending on engine — the early four‑cylinder units run £1,500–£3,000, while the M279 V12 in the G 65 AMG can cost £10,000–£18,000. Fitting adds £780–£1,560. Use our calculator for a personalised quote.

Which Mercedes W463 engine is the most reliable?

The OM603 3.0‑litre six‑cylinder diesel (300 GD) is legendary for its durability — it's a simple, cast‑iron block unit that can exceed 300,000 miles with regular maintenance. Among petrols, the M113 V8 is robust, while the OM642 V6 diesel is reliable but suffers from oil‑cooler seal leaks.

What are the common problems with the Mercedes W463?

OM642 V6 diesels suffer oil‑cooler seal leaks; M113/M273 V8 petrols can develop timing‑chain stretch; M157 V8s (G 63) can experience cam lifter wear; M279 V12s (G 65) have expensive coil pack and turbo issues; and early diesels can suffer from injection pump wear. Regular servicing is critical across all engines.

Is the Mercedes W463 reliable?

It depends heavily on the engine and era. Early diesels (OM602/OM603) are near‑bulletproof. The OM642 V6 diesel is robust but has a well‑documented oil‑cooler seal weakness. The M113 V8 is solid, while the M157 and M279 are high‑performance engines that demand meticulous maintenance. Overall, a well‑maintained W463 can be exceptionally durable.

Which Mercedes W463 engine should I avoid?

No engine is an outright "avoid" — but a high‑mileage G 65 AMG (M279 V12) without full service history should be approached with extreme caution due to eye‑wateringly expensive parts. Similarly, an early G 55 AMG (M113 supercharged) with neglected supercharger maintenance warrants careful inspection.

How do I know if my W463 engine needs replacing?

Key warning signs include: cold‑start rattle (M113/M273 chain), burning oil smell (OM642 seals), a ticking from the top end (M157 lifters), rough idle or hesitation (injection pump on early diesels), or misfires on V12s (coil packs). If you experience any of these, get a diagnosis immediately — early intervention saves thousands.

Is it worth replacing a Mercedes W463 engine, or should I scrap the car?

Depends on the car's value. Against a well‑kept £40,000 W463, a £5,500 OM642 recon is 14% of the car's value — safe if the car is otherwise sound. Against a tired £12,000 example, the same recon is 46% — safe but approaching our 70% Mercedes threshold. Use our 70% rule as your guide.

How long do Mercedes W463 engines last?

With proper maintenance, the OM603 diesel can exceed 300,000 miles, and the OM602 diesel is similarly durable. The M113 V8 can reach 200,000+ miles with regular oil changes. The OM642 V6 diesel is robust but the oil‑cooler seals will need replacement at around 100,000 miles. The M157 and M279 are durable but demand expensive preventative maintenance.

What is the difference between the W463 and W460?

The W460 was the first‑generation G‑Class (1979–1991) with part‑time four‑wheel drive and leaf‑spring rear suspension. The W463 (1990–2018, this page) introduced permanent 4MATIC all‑wheel drive, ABS, and a more refined interior. The W463 also offered more powerful engine options, including AMG V8s and the V12.

How do I find my Mercedes W463 engine code?

Listed on the VIN plate (visible through the windscreen) and in the vehicle documentation. The code is stamped on the engine block — on early diesels it's on the left side, on OM642/M113 it's on the front left, and on M157/M279 it's on the right side. Tell us your variant and registration year, and we'll identify it for you.

W463 Engine Replacement Cost UK

Mercedes G‑Class W463 Engine Codes — The Complete Database

Engine CodeFuelPowerYearsReliabilityEnquiriesAvg. Recon Cost

Overview

Mercedes G‑Class W463 — Overview

The W463 is the second generation of the Mercedes‑Benz G‑Class, produced from 1990 to 2018.

It succeeded the W460 and introduced permanent 4MATIC all‑wheel drive, anti‑lock brakes, and a trio of electronically‑locking differentials — making it one of the most capable off‑road vehicles ever built. A major facelift in 2012 brought new engines — including the 5.5‑litre twin‑turbo V8 in the G 63 AMG and the 6.0‑litre V12 in the G 65 AMG — and updated interior and exterior styling. The W463 was available as a closed off‑roader and, from 1990 to 2011, as a cabriolet. Its engine range spans from the 2.3‑litre four‑cylinder petrol to the 6.0‑litre twin‑turbo V12.

Key Facts

Platform

Mercedes‑Benz W463

Predecessor

W460

Successor

W464

Sibling body styles in this generation

Cabriolet (1990–2011)

Market Intelligence

No W463‑specific enquiry figure is available; OM642 diesel enquiries dominate the broader Mercedes compact‑car parc, with 880 UK requests in 2025 [MB‑VERIFIED].

Mercedes G‑Class W463 — Overview

The W463 is the second generation of the Mercedes‑Benz G‑Class, produced from 1990 to 2018.

It succeeded the W460 and introduced permanent 4MATIC all‑wheel drive, anti‑lock brakes, and a trio of electronically‑locking differentials — making it one of the most capable off‑road vehicles ever built. A major facelift in 2012 brought new engines — including the 5.5‑litre twin‑turbo V8 in the G 63 AMG and the 6.0‑litre V12 in the G 65 AMG — and updated interior and exterior styling. The W463 was available as a closed off‑roader and, from 1990 to 2011, as a cabriolet. Its engine range spans from the 2.3‑litre four‑cylinder petrol to the 6.0‑litre twin‑turbo V12.

Key Facts

Platform

Mercedes‑Benz W463

Predecessor

W460

Successor

W464

Sibling body styles in this generation

Cabriolet (1990–2011)

Market Intelligence

No W463‑specific enquiry figure is available; OM642 diesel enquiries dominate the broader Mercedes compact‑car parc, with 880 UK requests in 2025 [MB‑VERIFIED].

Best & Worst Engines

Mercedes G‑Class W463 — Ownership Economics

EngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership Verdict

M102.989100k–150kTiming chain stretch£600–£1,200£1,500–£3,000

Classic Petrol — simple, but ageing

OM602.931150k–250kInjector wear£300–£600£1,800–£3,500

Proven Diesel — bulletproof five‑cylinder

OM603.970150k–250kInjection pump£500–£1,000£2,000–£4,000

Best Diesel — robust six‑cylinder

M104.995100k–150kHead gasket£800–£1,500£2,200–£4,500

Classic Petrol — smooth, but ageing

M112.945100k–150kTiming chain stretch£600–£1,200£2,200–£4,500

Solid V6 — reliable, but chain watch

OM612.965100k–200kEGR, injectors£300–£800£2,000–£4,000

Solid Diesel — simple and robust

M113.943 / .944100k–200kTiming chain stretch£800–£1,500£3,500–£6,500

V8 Grunt — robust, but chain watch

OM628.962100k–200kTurbo, injectors£800–£2,000£4,000–£7,000

V8 Diesel — rare, complex

M113.98260k–120kSupercharger, timing chain£1,500–£3,000£5,000–£9,000

AMG Classic — high performance, high cost

OM642.853 / .85880k–150kOil‑cooler seals£800–£1,500£3,200–£5,500

V6 Torque — smooth, but seals leak

M273.963 / .96980k–150kTiming chain stretch£800–£1,500£4,000–£7,500

V8 Refinement — smooth, chain watch

M276.95580k–150kWater pump, carbon build‑up£300–£800£3,000–£5,500

Solid Petrol — reliable modern V6

M157.98440k–80kCam lifters, turbo wear£1,500–£4,000£7,000–£14,000

AMG Tax — high performance, high cost

M279.98040k–80kCoil packs, turbo wear£2,000–£5,000£10,000–£18,000

V12 Monster — rare, extremely costly

M176.98060k–100kWater pump, PCV£400–£800£5,000–£9,000

Modern V8 — reliable twin‑turbo

M177.98040k–80kCam lifters, turbo wear£1,500–£4,000£7,500–£14,000

AMG Modern — high performance, high cost

EngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership Verdict

M102.989100k–150kTiming chain stretch£600–£1,200£1,500–£3,000

Classic Petrol — simple, but ageing

OM602.931150k–250kInjector wear£300–£600£1,800–£3,500

Proven Diesel — bulletproof five‑cylinder

OM603.970150k–250kInjection pump£500–£1,000£2,000–£4,000

Best Diesel — robust six‑cylinder

M104.995100k–150kHead gasket£800–£1,500£2,200–£4,500

Classic Petrol — smooth, but ageing

M112.945100k–150kTiming chain stretch£600–£1,200£2,200–£4,500

Solid V6 — reliable, but chain watch

OM612.965100k–200kEGR, injectors£300–£800£2,000–£4,000

Solid Diesel — simple and robust

M113.943 / .944100k–200kTiming chain stretch£800–£1,500£3,500–£6,500

V8 Grunt — robust, but chain watch

OM628.962100k–200kTurbo, injectors£800–£2,000£4,000–£7,000

V8 Diesel — rare, complex

M113.98260k–120kSupercharger, timing chain£1,500–£3,000£5,000–£9,000

AMG Classic — high performance, high cost

OM642.853 / .85880k–150kOil‑cooler seals£800–£1,500£3,200–£5,500

V6 Torque — smooth, but seals leak

M273.963 / .96980k–150kTiming chain stretch£800–£1,500£4,000–£7,500

V8 Refinement — smooth, chain watch

M276.95580k–150kWater pump, carbon build‑up£300–£800£3,000–£5,500

Solid Petrol — reliable modern V6

M157.98440k–80kCam lifters, turbo wear£1,500–£4,000£7,000–£14,000

AMG Tax — high performance, high cost

M279.98040k–80kCoil packs, turbo wear£2,000–£5,000£10,000–£18,000

V12 Monster — rare, extremely costly

M176.98060k–100kWater pump, PCV£400–£800£5,000–£9,000

Modern V8 — reliable twin‑turbo

M177.98040k–80kCam lifters, turbo wear£1,500–£4,000£7,500–£14,000

AMG Modern — high performance, high cost

The W463 rule

A £3,200–£5,500 OM642 recon against a £15,000–£60,000 W463 sits at 5–37% of the car’s value — generally safe. Against a sub‑£15,000 example, the same recon can brush our 70% Mercedes threshold — we’ll honestly tell you to walk away. Against a well‑kept £40,000+ example, the same recon drops to a routine 8–14% — a straightforward repair decision. Value the car first.

Key Takeaways

Which W463 Costs Least To Own?
OM602/OM603 diesels — simple, robust, cheap to fix.
Which W463 Costs Most To Own?
M279 V12 — AMG V12 parts and labour are eye‑wateringly expensive.
Which W463 Is Best Value?
Post‑2012 G 350 BlueTEC (OM642) — modern diesel capability without V8 running costs.

Common Problems

01

OM642

Oil‑Cooler Seal Leak

Affected models:

W463 G 320 CDI, G 350 CDI, G 350 BlueTEC (OM642 V6 diesel).

Typical failure mileage:

80,000–150,000 miles.

Root cause:

The oil‑cooler O‑rings in the V of the OM642 engine degrade with heat cycling, causing oil leaks that can drip onto the exhaust and create a burning smell. Labour is intensive as the intake manifold must be removed.

Tiered Cost Table

Preventative (Repair)

Dealer

Specialist

£1,500–£2,500

£800–£1,500

Replace oil‑cooler seals

Catastrophic (Replacement)

Dealer

Specialist

£5,000–£7,500

£3,200–£5,500

Full reconditioned engine

Our Recommendation

If you notice a burning oil smell or oil residue in the engine V, have the oil‑cooler seals replaced immediately — an £800–£1,500 repair is cheaper than the £3,200+ replacement that follows if the engine runs low on oil.

Compare OM642 engine prices for your W463

02

M113

/ M273 Timing‑Chain Stretch

Affected models:

W463 G 500 (M113/M273 V8 petrol).

Typical failure mileage:

80,000–150,000 miles.

Root cause:

The timing chain on M113 and M273 V8 engines can stretch over time, particularly if oil changes have been neglected. Rattle on start‑up is the classic warning sign.

Tiered Cost Table

Preventative (Repair)

Dealer

Specialist

£1,500–£2,500

£800–£1,500

Replace chain, tensioner, guides

Catastrophic (Replacement)

Dealer

Specialist

£5,000–£8,000

£3,500–£6,500

Full reconditioned engine

Our Recommendation

At the first sign of rattle on start‑up, get the chain inspected immediately — an £800–£1,500 preventative repair is far cheaper than the £3,500+ replacement that follows if ignored.

Compare M113 / M273 engine prices for your W463

03

M157

Cam Lifter & Turbo Wear (G 63 AMG)

Affected models:

W463 G 63 AMG (M157 5.5 V8 twin‑turbo).

Typical failure mileage:

40,000–80,000 miles.

Root cause:

The high‑output M157 engine can suffer from cam lifter wear and turbocharger issues, particularly if oil changes have been neglected. Ticking from the top end is the classic warning sign.

Tiered Cost Table

Preventative (Repair)

Dealer

Specialist

£3,000–£5,000

£1,500–£4,000

Replace cam lifters and adjusters

Catastrophic (Replacement)

Dealer

Specialist

£12,000–£18,000

£7,000–£14,000

Full reconditioned engine

Our Recommendation

If you’re buying a G 63 AMG, budget for a cam lifter inspection and insist on full service history — a £1,500–£4,000 preventative repair is a fraction of the £7,000+ replacement that follows a full failure. This is the price of AMG ownership.

Compare M157 engine prices for your G 63 AMG

04

M279

Coil Pack & Turbo Wear (G 65 AMG)

Affected models:

W463 G 65 AMG (M279 6.0 V12 twin‑turbo).

Typical failure mileage:

40,000–80,000 miles.

Root cause:

The V12 M279 engine has 12 individual coil packs that can fail, and the twin turbos can develop wear. Parts are extremely expensive and often specialist‑only.

Tiered Cost Table

Preventative (Repair)

Dealer

Specialist

£4,000–£6,000

£2,000–£5,000

Replace coil packs, inspect turbos

Catastrophic (Replacement)

Dealer

Specialist

£15,000–£22,000

£10,000–£18,000

Full reconditioned engine

Our Recommendation

If you’re buying a G 65 AMG, budget for a full inspection and insist on meticulous service history — coil pack replacement and turbo work are inevitable on high‑mileage examples. This is the ultimate AMG tax.

Compare M279 engine prices for your G 65 AMG

W463 Engine Replacement Costs — By Engine and Condition

VariantEngine CodeUsed (Supply)Reconditioned (Supply)Rebuilt (Supply)Labour Hours

230 GEM102.989£800–£1,500£1,500–£3,000£2,500–£4,0008–12 hrs

250 GDOM602.931£900–£1,800£1,800–£3,500£3,000–£5,0008–12 hrs

300 GDOM603.970£1,000–£2,000£2,000–£4,000£3,500–£5,5008–12 hrs

320 GEM104.995£1,200–£2,500£2,200–£4,500£3,500–£6,0008–12 hrs

G 320 (V6)M112.945£1,200–£2,500£2,200–£4,500£3,500–£6,00010–14 hrs

G 270 CDIOM612.965£1,000–£2,200£2,000–£4,000£3,000–£5,50010–14 hrs

G 500 (V8)M113.943 / .944£1,800–£3,500£3,500–£6,500£5,000–£8,50012–16 hrs

G 400 CDIOM628.962£2,200–£4,000£4,000–£7,000£6,000–£9,00014–18 hrs

G 55 AMGM113.982£2,500–£5,000£5,000–£9,000£7,500–£12,00014–18 hrs

G 320 CDI, G 350 CDIOM642.853£1,800–£3,200£3,200–£5,500£5,000–£7,50012–16 hrs

G 500 (V8, 2008–2012)M273.963 / .969£2,000–£4,000£4,000–£7,500£6,000–£10,00012–16 hrs

G 350 BlueTECOM642.858£1,800–£3,200£3,200–£5,500£5,000–£7,50012–16 hrs

G 350 (petrol)M276.955£1,500–£3,000£3,000–£5,500£4,500–£7,50010–14 hrs

G 63 AMG (5.5)M157.984£4,000–£7,000£7,000–£14,000£10,000–£18,00016–22 hrs

G 65 AMGM279.980£6,000–£10,000£10,000–£18,000£14,000–£22,00018–24 hrs

G 500 (4.0)M176.980£2,800–£5,000£5,000–£9,000£7,500–£12,00012–16 hrs

G 63 AMG (4.0)M177.980£4,000–£7,500£7,500–£14,000£10,000–£18,00016–22 hrs

No Generation variance from the Model Page’s baseline figures — W463 shares its engine bay architecture across its long production run, so costs are inherited directly per the Authority Model, with no divergence note required. OM642 and M276 costs carried forward from the EM data’s Table A.

Core Variants

Diesel Variants

250 GD300 GDG 270 CDIG 320 CDIG 350 CDIG 350 BlueTECG 400 CDI

Petrol Variants

230 GE320 GEG 320G 500G 55 AMGG 63 AMGG 65 AMGG 350 (petrol)

Scope note: All variants listed are W463 closed off‑roader. The Cabriolet (1990–2011) shares most of these engines but is covered on its own Generation Page, since fitment and labour access vary slightly by body style.

Core Variants

Diesel Variants

250 GD300 GDG 270 CDIG 320 CDIG 350 CDIG 350 BlueTECG 400 CDI

Petrol Variants

230 GE320 GEG 320G 500G 55 AMGG 63 AMGG 65 AMGG 350 (petrol)

Scope note: All variants listed are W463 closed off‑roader. The Cabriolet (1990–2011) shares most of these engines but is covered on its own Generation Page, since fitment and labour access vary slightly by body style.

Market Intelligence

Most Requested E90 Engines (2025)

Most Requested E90 Variants

Average E90 Replacement Cost

Most Common E90 Failures

FAQ

BMW 3 Series E90 rear three-quarter view

Why UK Mercedes W463 Owners Trust MercedesEngines.uk

Trusted W463 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real W463 owners, as part of the Engine Finders network.
Compare W463 Engine Replacement Companies
see prices, warranty terms and supply‑&‑fit options side‑by‑side before you commit.
UK Engine Replacement Services for W463
covering every variant from 230 GE to G 65 AMG, with supply‑only or full supply‑&‑fit available nationwide.

Find the best Mercedes W463 engine replacement UK drivers rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare Mercedes G‑Class W463 Engine Prices on EnginesMarket

Why UK Mercedes W463 Owners Trust MercedesEngines.uk

Trusted W463 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real W463 owners, as part of the Engine Finders network.
Compare W463 Engine Replacement Companies
see prices, warranty terms and supply‑&‑fit options side‑by‑side before you commit.
UK Engine Replacement Services for W463
covering every variant from 230 GE to G 65 AMG, with supply‑only or full supply‑&‑fit available nationwide.

Find the best Mercedes W463 engine replacement UK drivers rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare Mercedes G‑Class W463 Engine Prices on EnginesMarket

Mercedes G‑Class W463 Engines — The Complete UK Guide

Mercedes G‑Class W463 Engine Codes — The Complete Database

Mercedes G‑Class W463 — Overview

Mercedes G‑Class W463 — Overview

Best & Worst Engines

Mercedes G‑Class W463 — Ownership Economics

Common Problems

W463 Engine Replacement Costs — By Engine and Condition

Core Variants

Core Variants

Market Intelligence

FAQ

Why UK Mercedes W463 Owners Trust MercedesEngines.uk

Why UK Mercedes W463 Owners Trust MercedesEngines.uk