AMG GT M178 V8 Engines
from £8,000 to £16,000
Rebuilt units from £8,000 · Common codes: M178, M178 LS1, M178 LS2, M177
Mercedes-Benz ENGINE MARKETPLACE
Mercedes AMG GT M178/M177 Performance Engine Replacement - Rebuilt & Options
Get quotes from UK Mercedes AMG GT performance engine specialists. Compare rebuilt & reconditioned engines for GT to GT 63 S E Performance - M178/M177 covered. Find UK performance engine specialists.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
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AMG GT 43 Straight Six Engines
from £5,500 to £9,500
Rebuilt units from £5,500 · Common codes: M256, M256 E30, M256 M30
AMG GT Black Series Performance Engines
from £14,000 to £22,000
Rebuilt units from £14,000 · Common codes: M178 LS3, M178 Flat Plane, M178 GT R
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Supply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsHow It Works
3 Simple Steps3 Simple Stepsto Finding the Best Mercedes Benz AMG GT Replacement Engineto Finding the Best Mercedes Benz AMG GT Replacement Engine
12-Month Warranty
Supply & Fit Available
Nationwide Delivery
Trusted UK Suppliers
Most replacements completed within 3-5 days.
Live UK Engine Market Data
What Are UK Drivers Paying for Mercedes-Benz AMG GT Engine Replacement
The table below shows typical UK rebuilt engine costs across Mercedes-Benz AMG GT variants, covering documented failure causes, chassis generations, engine codes, and fuel types based on current market data.
Average Market Prices
↻ Last updated: 4 Aug 26, 9:26
Customer Reviews
Trusted by Mercedes Benz AMG GT Owners Across the UK
Rated 4.8 out of 5 by 1,081 verified customers who sourced reconditioned and used Mercedes Benz AMG GT engines through EngineMarket.
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Variants We Cover
Mercedes-Benz AMG GT Engine ReplacementAll Variants Covered
Mercedes-Benz AMG GT
M178 4.0L Petrol
Rebuilt Engines: £8,000-£15,000
Mercedes-Benz AMG GT Black Series
M178 4.0L Petrol
Rebuilt Engines: £15,000-£22,000
Mercedes-Benz AMG GT Roadster
M178 4.0L Petrol
Rebuilt Engines: £8,500-£15,500
Mercedes-Benz AMG GT 55
M177 4.0L Petrol
Rebuilt Engines: £9,500-£16,500
AMG GT
Engine Codes
Mercedes-Benz AMG GT Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Mercedes-Benz AMG GT 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.
Petrol Engines
Extracted from detailed petrol and performance engine families across Mercedes Benz AMG GT variants.
M178 - 4.0L Petrol (Base Tune)
Main replacement demand comes from timing-chain, cooling-system and performance thermal-management faults.
Compatible variants
GTGT Roadster
Avg. rebuilt price
£8,000 - £15,000
Supply only
Technical specifications
- Fuel type
- Petrol
- Engine size
- 4.0L
- Power output
- 462-476 hp
- Years fitted
- 2014-2023
Common failures
- ●Main replacement demand comes from timing-chain, cooling-system and performance thermal-management faults.
- ●Confirm exact engine code and fitment before ordering.
- ●Ask for warranty and supply & fit terms.
Not sure which engine code?
Can't find your engine code- Enter your registration number above - we'll instantly identify the exact unit, its technical specifications, and live replacement prices from UK Mercedes-Benz AMG GT engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.
AMG GT
Common Problems
Mercedes-Benz AMG GT Engine Problems - What It Costs to Fix & When Replacement Makes Sense
The M178 V8 is a masterpiece of performance engineering, but even hand-built AMG units have known weak points. Timing chain stretch and turbo failures dominate replacement demand across C190 and R190 GT models. Every rebuilt engine supplied through EngineMarket includes upgraded components designed to address the original failure point - plus a minimum...
Mercedes-Benz AMG GT Timing Chain Stretch - Why M178 V8 Engines Fail Prematurely
Mercedes-Benz AMG GT Timing Chain Stretch
Most affected vehicles
Mercedes-Benz AMG GTGT S
Mercedes-Benz AMG GT, GT S, GT C, GT R, GT Roadster (2015-2021, M178, M178 LS1, M178 LS2)
Failure mileage range
50,000 - 80,000 miles
Typical failure window
Root cause
The single-row timing chain fitted to early M178 engines elongates under high thermal load, particularly on cars with frequent track use or aggressive downshifting. Chain slack allows the camshaft sprockets to jump timing, leading to valve-to-piston contact.
Repair options & estimated costs (UK ranges)
| Repair tier | Dealer price | Specialist price | What it involves | Longevity / suitability |
|---|---|---|---|---|
| Minor - Preventative Chain Replacement | £3,800 - £5,500 | £2,400 - £3,200 | Replace timing chain, tensioner, guides, cam sprockets | Viable only before chain slip occurs. No warning signs = act early. |
| Major - Cylinder Head Rebuild | £6,500 - £9,000 | £4,500 - £6,500 | Remove head, replace bent valves, lap seats, new gaskets | For engines with minor valve contact. Adds 40-60k miles typically. |
| Full Replacement - Rebuilt M178 | £14,000 - £18,000 | £9,000 - £15,000 | Supply & fit fully rebuilt engine with upgraded chain and guides | Complete solution with 12-month warranty. Includes uprated double-row chain. |
Our recommendation
On an AMG GT worth £35,000-£80,000, preventative chain replacement is significantly cheaper than waiting for failure. The moment you hear a metallic rattle on cold start from the rear of the engine, act immediately. If the chain has already slipped, replacement costs approach rebuild territory - at which point a fully rebuilt engine with upgraded internals makes better financial sense than repairing damaged heads.
Compare rebuilt M178 engine prices for your Mercedes-Benz AMG GTReplacement Engine Options
Mercedes-Benz AMG GT Engine TypesOptions, Costs & What to Expect
Every engine type is available through our UK network with typical price ranges based on your AMG GT variant, M178 or M177 engine code and budget.
Mercedes-Benz AMG GT Reconditioned Engines (Recon)£8,500 - £15,000((supply only))
Mercedes-Benz AMG GT Rebuilt Engines£8,000 - £16,000((supply only))
Mercedes-Benz AMG GT Used Engines£5,500 - £11,000((supply only))
Mercedes-Benz AMG GT Remanufactured Engines£10,000 - £18,000((supply only))
Mercedes-Benz AMG GT Refurbished Engines£4,500 - £8,500((supply only))
Compare Mercedes Benz AMG GT engine prices with vetted UK suppliers
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 AMG GT within hours.
Engine Sizes
Mercedes-Benz AMG GT Engines by SizeFind the Right Displacement for Your Variant
Every displacement ever fitted to the AMG GT across all generations is listed below, with compatible engine codes, production years, power outputs and common failure notes.
The M139 four-cylinder engine arrived with the second-generation C192 GT 43 in 2024, marking a controversial departure from the GT's V8 heritage. Despite AMG's claim that it is the "world's most powerful four-cylinder," producing over 400hp from 2.0 litres, enthusiast demand has remained firmly with the V8 options.
⚙
Engine Code(s)
M139, M139 (MHEV)
▣
Compatible Models (UK)
GT 43 (C192, 2024-present), GT 43 4MATIC+
ϟ
Power output
Verified by registration
△
Common Failure Points
High-pressure fuel pump seizure (70k+ miles), turbo bearing wear under sustained boost, ISG overheating
Production Years: C192, 2024-present
Compare Mercedes-Benz AMG GT 2.0L petrol engine pricesMercedes-Benz AMG GT Engines Fuel Type
Mercedes-Benz AMG GT Engines by Fuel Type
Choose your Mercedes-Benz AMG GT engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from the entry-level GT to the fire-breathing Black Series.
Mercedes-Benz AMG GT Petrol Engines
PetrolThe AMG GT is defined by its hand-built V8 petrol engines, though the second-generation C192 introduced a four-cylinder option and a straight-six mild hybrid.
Common Mercedes-Benz AMG GT Petrol Engine Families
- •M178 - The original AMG GT V8, dry-sump, hot-vee, cross-plane crank (GT, GT S, GT C)
- •M178 LS2 - Track-focused unit for GT R and GT R Pro with upgraded oiling and turbos
- •M178 LS3 - Flat-plane crank V8 exclusive to the 730hp Black Series
Found In
- •C190/R190 Coupe & Roadster (2015-2021) - M178, M178 LS1, M178 LS2, M178 LS3
- •X290 4-Door Coupe (2018-present) - M256 (GT 53), M177 (GT 63/63 S)
- •C192 Second Generation (2024-present) - M139 (GT 43), M256 (GT 53), M177 (GT 55/63/63 S)
Known For
- •Hand-built "One Man, One Engine" assembly with builder's signature on each unit
- •M178 timing chain stretch as the #1 replacement driver (50k-80k miles)
- •Hot-vee turbo actuator failures and coolant crossover pipe leaks
1 of 3
Mercedes-Benz AMG GT Petrol Engines
PetrolThe AMG GT is defined by its hand-built V8 petrol engines, though the second-generation C192 introduced a four-cylinder option and a straight-six mild hybrid.
Common Mercedes-Benz AMG GT Petrol Engine Families
- •M178 - The original AMG GT V8, dry-sump, hot-vee, cross-plane crank (GT, GT S, GT C)
- •M178 LS2 - Track-focused unit for GT R and GT R Pro with upgraded oiling and turbos
- •M178 LS3 - Flat-plane crank V8 exclusive to the 730hp Black Series
Found In
- •C190/R190 Coupe & Roadster (2015-2021) - M178, M178 LS1, M178 LS2, M178 LS3
- •X290 4-Door Coupe (2018-present) - M256 (GT 53), M177 (GT 63/63 S)
- •C192 Second Generation (2024-present) - M139 (GT 43), M256 (GT 53), M177 (GT 55/63/63 S)
Known For
- •Hand-built "One Man, One Engine" assembly with builder's signature on each unit
- •M178 timing chain stretch as the #1 replacement driver (50k-80k miles)
- •Hot-vee turbo actuator failures and coolant crossover pipe leaks
Mercedes-Benz AMG GT Mild Hybrid (MHEV) Engines
MHEVThe second-generation C192 and X290 4-Door Coupe use 48V mild hybrid systems integrated with petrol engines - not full hybrids, but electrified assistance.
Mercedes-Benz AMG GT MHEV Engine Codes
- •M256 - 3.0L straight-six with Integrated Starter-Generator (ISG) and electric auxiliaries
- •M139 - 2.0L four-cylinder with belt-driven starter-generator (GT 43)
- •48-volt integrated starter-generator (ISG) replaces alternator and starter motor
Found In
- •GT 53 4MATIC+ (X290, 2018-present; C192, 2024-present)
- •GT 43 4MATIC+ (C192, 2024-present)
Important Notes
- •MHEV engines require hybrid system inspection during replacement
- •ISG module overheating documented on 2023-2024 X290 units
- •No plug-in capability - mild hybrid only, not a PHEV
Mercedes-Benz AMG GT Plug-in Hybrid (PHEV) Engines
PHEVThe GT 63 S E Performance is the only plug-in hybrid AMG GT, combining the M177 V8 with a rear-axle electric motor for a combined 816hp.
Mercedes-Benz AMG GT PHEV Engine Codes
- •M177 E20 - 4.0L V8 biturbo with integrated electric motor on rear axle
- •6.1kWh battery powers a rear-mounted electric motor (150kW / 201hp)
- •Electric-only range of approximately 8-10 miles at low speeds
Found In
- •GT 63 S E Performance (C192, 2024-present)
- •GT 63 S E Performance 4MATIC+ (C192, 2024-present)
Important Notes
- •High-voltage system requires specialist handling during engine replacement
- •PHEV engine availability is significantly more limited than standard petrol units
- •Hybrid coolant leaks from battery thermal management are a documented failure point
Not sure which fuel type your Mercedes-Benz AMG GT 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 AMG GT specialists.
Engine YearsGet quotes for 2014-2015 Mercedes-Benz AMG GT replacement engines →
Mercedes-Benz AMG GT Engines by YearWhat Was Fitted & WhenMercedes-Benz AMG GT Engines by Year - What Was Fitted & When
From the 2015 launch of the C190 coupe to the 2024 second-generation C192, this timeline covers every AMG GT engine change by year - helping you identify your exact unit and compare rebuilt prices from UK specialists.
⚙Key Changes
- ✓C190 coupe launched at Paris Motor Show (October 2014)
- ✓GT (462hp) and GT S (510hp) variants available from launch
- ✓Dry-sump oiling system introduced for track-focused durability
- ✓First AMG engine with "hot-vee" turbo layout
▣Main Engines
M178- 4.0L petrol (GT, 462hp)
M178LS1 - 4.0L petrol (GT S, 510hp)
M157- 5.5L petrol (very early GT / GT S units, 550-585hp)
▰Popular Models
- •Mercedes-Benz AMG GT
- •Mercedes-Benz AMG GT S
🔧Known For
- ✓Hand-built "One Man, One Engine" assembly signature on every unit
- ✓Early M178 units prone to timing chain stretch from 50,000 miles
- ✓Dry-sump system requires specialist knowledge for correct oil filling
- ✓M157 phased out within 12 months - rare and collectable
Engine Codes Covered:
M178M178 LS1M157Not sure which year your Mercedes-Benz AMG GT 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 AMG GT specialists.
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