Mercedes Benz G Class G 63 AMG Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK Mercedes Benz G Class G 63 AMG engine specialists. Compare prices on reconditioned, rebuilt and used M157 and M177 twin-turbo V8 engines - supply & fit available nationwide.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £6,995 to £15,000
Used from £3,500 · Reconditioned from £5,800 · Common codes: M157.984, M177.980
From £3,500
Tested, bare/short engine
From £5,800
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best Mercedes Benz G Class G 63 AMG Replacement Engineto Finding the Best Mercedes Benz G Class G 63 AMG Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryMercedes Benz G Class G 63 AMG - Engine History & Specs at a Glance
The Mercedes Benz G 63 AMG represents the pinnacle of G-Class performance, evolving from the 5.5-litre M157 twin-turbo V8 in the W463 generation to the 4.0-litre M177 twin-turbo V8 in the current W464 platform - each hand-built by AMG and delivering supercar-rivalling power from a boxy off-road icon.
Variant HistoryMercedes Benz G Class G 63 AMG - Engine History & Specs at a Glance
The Mercedes Benz G 63 AMG represents the pinnacle of G-Class performance, evolving from the 5.5-litre M157 twin-turbo V8 in the W463 generation to the 4.0-litre M177 twin-turbo V8 in the current W464 platform - each hand-built by AMG and delivering supercar-rivalling power from a boxy off-road icon.
Mercedes Benz G Class G 63 AMG
Fuel TypePetrol
Engine Size Range5.5L (M157) - 4.0L (M177)
Power Output Range544-585hp (plus 20hp hybrid boost on facelift models)Engine History Timeline
G 63 AMG launched with M157.984 5.5L twin-turbo V8 544hp, 760Nm, 7-speed AMG SPEEDSHIFT PLUS 7G-TRONIC
G 63 AMG 6x6 produced (2013-2015) M157 5.5L twin-turbo V8, 536hp
All-new W464 G 63 AMG introduced with M177.980 4.0L twin-turbo V8 585hp, 850Nm, 9-speed AMG SPEEDSHIFT TCT
W464 facelift M177 gains 48V mild-hybrid system with 20hp electric boost
Key Specs Snapshot
Fuel TypePetrolEngine Size Range5.5L (M157) - 4.0L (M177)Power Output Range544-585hp (plus 20hp hybrid boost on facelift models)Torque760-850NmYears Produced2012-presentEvery twin-turbo V8 engine fitted to the Mercedes Benz G Class G 63 AMG is covered below, with UK rebuilt pricing and known failure points from real owner experience.
Mercedes Benz G Class G 63 AMG Engine Codes - Specifications & Replacement CostMercedes Benz G Class G 63 AMG Engine Codes - Specifications & Replacement Cost
5.5L Twin-Turbo V8 (2012-2018)
Power Output544 hp @ 5,500 rpmTorque760 Nm @ 2,000-5,000 rpmDisplacement5,461ccYears Fitted2012-2018
Compatible Trim Levels
- G 63 AMG (W463)
- G 63 AMG Edition 463
- G 63 AMG 6x6
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£3,500-£5,500
Reconditioned
Addressed known issues, tested
£5,800-£7,800
Rebuilt
Full teardown, upgraded internals
£6,995-£12,000
Common Failure
The M157 is prone to timing chain stretch on early 2011-2012 models due to oil drainage issues from the cylinder head on start-up, as well as turbo actuator failure (A1570940001) causing limp mode and power loss. Camshaft adjuster wear and valve cover oil leaks are also documented.
The Mercedes Benz G Class G 63 AMG relies on two of AMG's most celebrated twin-turbo V8s - the M157 and M177. While both are engineering masterpieces, they have developed well-documented reputations for specific, predictable failures. Turbo actuator failure on the M157 and oil separator failure on the M177 dominate replacement demand, while timing chain wear and oil consumption affect both families. 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 63 AMG engine failures, what they cost to fix, and when replacement is the smarter financial decision.
Why the G 63 AMG Loses Power and Enters Limp Mode
Affected Vehicles
Mercedes Benz G Class G 63 AMG (M157.984, 2012-2018)
Typical Failure Mileage
45,000 - 70,000 miles
Root Cause
The electronic turbo actuator (A1570940001) suffers internal gear and sensor degradation, causing the wastegate to stop responding - typically triggering limp mode and a check engine light. The high boost pressure and extreme heat generated by the twin turbos put significant stress on the actuator components.
Why It Happens
The electronic turbo actuator (A1570940001) suffers internal gear and sensor degradation, causing the wastegate to stop responding - typically triggering limp mode and a check engine light. The high boost pressure and extreme heat generated by the twin turbos put significant stress on the actuator components.
Dealer (parts + labour)
£1,200-£1,800
Specialist (parts + labour)
£600-£950
What it involves
Replace faulty turbo actuator, recalibrate wastegate position, road test
Suitability
50k-70k miles; viable if turbo core is healthy
1 - 2 daysDealer (parts + labour)
£3,000-£4,500
Specialist (parts + labour)
£1,800-£2,800
What it involves
Replace both actuators (twin turbo), inspect turbo cores, new gaskets
Suitability
70k-100k miles; recommended if mileage high
1 - 2 daysDealer (parts + labour)
£14,000-£18,000
Specialist (parts + labour)
£6,995-£12,000
What it involves
Supply & fit rebuilt M157 with upgraded actuators, new turbos if required
Suitability
Full long-block warranty; for catastrophic turbo debris ingestion
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Minor - Actuator Replacement (Single Turbo) Minor | £1,200-£1,800 | £600-£950 | Replace faulty turbo actuator, recalibrate wastegate position, road test | 50k-70k miles; viable if turbo core is healthy | 1 - 2 days |
 Major - Both Actuators & Turbo Service Best Value | £3,000-£4,500 | £1,800-£2,800 | Replace both actuators (twin turbo), inspect turbo cores, new gaskets | 70k-100k miles; recommended if mileage high | 1 - 2 days |
Full Replacement - Rebuilt Engine Best Value | £14,000-£18,000 | £6,995-£12,000 | Supply & fit rebuilt M157 with upgraded actuators, new turbos if required | Full long-block warranty; for catastrophic turbo debris ingestion | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical G 63 AMG (2012-2018) is worth £35,000-£80,000 depending on condition and mileage - the full replacement cost of £6,995-£12,000 is modest relative to vehicle value, making a specialist rebuilt engine excellent value. For vehicles worth under £25,000, evaluate repair options first.
Our Recommendation
Our Recommendation
On an AMG G 63 worth £35,000-£80,000, specialist actuator replacement at £600-£950 is the obvious first step. Dealer pricing is inflated for this repair. However, if the failure has caused turbo debris to enter the engine (metal particles in oil), you must go straight to full engine replacement - ignoring this risks complete bottom end failure within 1,000 miles.
Don't Let Engine Failure Write Off Your Mercedes Benz G Class G 63 AMG
A failed twin-turbo V8 doesn't have to mean the end of your G 63 AMG. Whether you're dealing with an M157 turbo actuator failure, M177 oil separator failure, timing chain wear, or intercooler leaks, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Benz G Class specialists. Every rebuilt M157 and M177 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 rebuilt M157 Mercedes Benz G Class G 63 AMG engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"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 G 63 AMG. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Mercedes Benz G Class G 63 AMG Engine ReplacementFrequently Asked Questions
Question 1How much does it cost to replace a Mercedes G Class G 63 AMG engine in the UK-
A Mercedes G Class G 63 AMG engine replacement typically costs between £6,995 and £15,000 depending on engine code, condition type, and whether fitting is included. M157 units (2012-2018) range from £6,995 to £12,000, while M177 units (2018-present) range from £8,500 to £15,000.
- Rebuilt M157 (G 63 AMG 2012-2018): £6,995-£12,000 supply only
- Rebuilt M177 (G 63 AMG 2018-present): £8,500-£15,000 supply only
- Used engines from breakers: £3,500-£7,000 but higher risk
- Labour for supply & fit adds £1,000-£1,800 to any engine price
Question 2What are the signs of M157 turbo actuator failure in a G 63 AMG-
The M157's electronic turbo actuator typically fails between 45,000-70,000 miles, with several warning signs.
- Sudden loss of power and acceleration
- Check engine light illuminated
- Limp mode activation
- Fault code P0244 (Turbo Wastegate Actuator "A" Range/Performance)
- Rattling or clicking noise from the turbo area
Question 3Is the M177 engine in the G 63 AMG reliable-
The M177 is generally regarded as a reliable engine when properly maintained. However, it has several well-documented issues that owners should be aware of.
- Oil separator failure leading to rear main seal leaks
- Intercooler leaks causing coolant loss and misfires
- Excessive oil consumption
- Timing chain stretch on some examples
- Regular maintenance with 0W-40 oil and 5,000-7,000 mile intervals is critical
Question 4Should I repair or replace my G 63 AMG engine-
Repair if the failure is isolated (e.g., turbo actuator on M157, oil separator on M177, timing chain tensioner). Replace if there's bottom end damage, bore scoring, or catastrophic turbo failure.
- M157 turbo actuator replacement: £600-£950 - excellent value if caught early
- M177 oil separator replacement: £500-£800 - preventative if caught early
- Full M157 rebuild: £6,995-£12,000 - for catastrophic failure or 120k+ miles
- Full M177 rebuild: £8,500-£15,000 - for catastrophic failure or 100k+ miles
- Given G 63 AMG values (£35,000-£180,000+), a rebuilt engine is typically excellent value
Question 5How do I know which engine code my G 63 AMG has-
Check your vehicle log book (V5C) for the engine number, which includes the engine code prefix.
- V5C log book shows full engine number with code prefix
- Engine code stamped on cylinder block
- G 63 AMG (2012-2018): M157.984 (5.5L twin-turbo V8)
- G 63 AMG (2018-present): M177.980 (4.0L twin-turbo V8)
- Service history documents list engine type
Question 6Can I fit a used G 63 AMG engine myself-
We strongly advise against DIY fitting on a G 63 AMG. The complex 4MATIC system, twin-turbo plumbing, gearbox alignment, and ECU coding requirements demand specialist equipment and expertise.
- 4MATIC transfer case alignment requires specialist knowledge
- Twin-turbo system requires precise reassembly
- ECU coding and immobiliser synchronisation needed
- Specialist supply & fit costs £1,000-£1,800 - worth every penny for an AMG
Question 7What warranty comes with a reconditioned G 63 AMG engine-
Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty, with many specialists offering 24-month coverage on M157 and M177 rebuilds. This includes parts and labour for any manufacturing defect or installation error.
- 12-month unlimited mileage is the minimum standard
- M157 and M177 rebuilds often include 24-month warranty
- All warranties cover parts, labour, and MOT compliance
- Extended warranties available at point of purchase
Why Choose UsCompare Mercedes Benz G Class G 63 AMG Twin-Turbo V8Engine PricesToday
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