Mercedes Benz G Class G 65 AMG Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK Mercedes Benz G Class G 65 AMG engine specialists. Compare prices on reconditioned, rebuilt and used M279 V12 twin-turbo engines - supply & fit available nationwide for this ultra-rare AMG flagship.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £15,000 to £25,000
Used from £8,500 · Reconditioned from £12,000 · Common codes: M279.982
From £8,500
Tested, bare/short engine
From £12,000
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 65 AMG Replacement Engineto Finding the Best Mercedes Benz G Class G 65 AMG Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryMercedes Benz G Class G 65 AMG - Engine History & Specs at a Glance
The Mercedes Benz G 65 AMG represents the absolute pinnacle of G-Class engine offerings - a twin-turbocharged 6.0-litre V12 that transformed the boxy off-roader into a 630hp luxury performance icon. With fewer than 500 units produced globally, the G 65 AMG remains one of the rarest and most coveted G-Class variants ever built.
Variant HistoryMercedes Benz G Class G 65 AMG - Engine History & Specs at a Glance
The Mercedes Benz G 65 AMG represents the absolute pinnacle of G-Class engine offerings - a twin-turbocharged 6.0-litre V12 that transformed the boxy off-roader into a 630hp luxury performance icon. With fewer than 500 units produced globally, the G 65 AMG remains one of the rarest and most coveted G-Class variants ever built.
Mercedes Benz G Class G 65 AMG
Fuel TypePetrol
Engine Size6.0L (5,980cc)
Power Output Range604-621hp across productionEngine History Timeline
G 65 AMG introduced M279.982 6.0L V12 twin-turbo, 604hp (612 PS), 1,001Nm torque, 7-speed AMG SPEEDSHIFT PLUS
Power output increased to 621hp (630 PS / 463kW) 1,001Nm torque, US market launch
2018 - Production continues with V12 unchanged 7G-TRONIC transmission, full-time 4WD
G 65 AMG Final Edition produced (65 units) featuring bronze 21-inch wheels, marking the end of V12 G-Class production
Key Specs Snapshot
Fuel TypePetrolEngine Size6.0L (5,980cc)Power Output Range604-621hp across productionTorque738 lb-ft (1,001 Nm) @ 2,300-4,300 rpmYears Produced2012-2018The M279 V12 engine fitted to the Mercedes Benz G Class G 65 AMG is covered below, with UK rebuilt pricing and known failure points from real owner experience of this ultra-rare powerplant.
Mercedes Benz G Class G 65 AMG Engine Codes - Specifications & Replacement CostMercedes Benz G Class G 65 AMG Engine Codes - Specifications & Replacement Cost
6.0L V12 Twin-Turbo (2012-2018)
Power Output604-621 hp (450-463 kW)Torque1,001 Nm (738 lb-ft) @ 2,300-4,300 rpmDisplacement5,980cc (6.0L)ConfigurationV12, twin-turbocharged, DOHC with variable valve timingCompression Ratio9.0:1Years Fitted2012-2018
Compatible Trim Levels
- G 65 AMG (W463)
- G 65 AMG Final Edition (2018)
- G 65 AMG Edition 463
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£8,500-£14,000
Reconditioned
Addressed known issues, tested
£12,000-£18,000
Rebuilt
Full teardown, upgraded internals
£15,000-£25,000
Common Failure
The M279 V12 is a masterpiece of engineering but suffers from several well-documented issues: turbocharger failure due to excessive heat and oil contamination, intercooler leaks reducing boost pressure, ignition coil failures caused by heat exposure, and oil leaks from degraded seals and gaskets.
The Mercedes Benz G Class G 65 AMG relies on the M279 V12 twin-turbo - an engine of extraordinary complexity and capability. While fundamentally robust when properly maintained, the V12's intricate systems have developed well-documented reputations for specific, expensive failures. Turbocharger failure, intercooler leaks, ignition coil degradation, and oil leaks dominate replacement demand. 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 65 AMG engine failures, what they cost to fix, and when replacement is the smarter financial decision.
Why the G 65 AMG Loses Power and Generates Smoke
Affected Vehicles
Mercedes Benz G Class G 65 AMG (M279.982, 2012-2018)
Typical Failure Mileage
40,000 - 70,000 miles
Root Cause
The twin-turbocharged V12 generates immense heat, which can cause oil seals to degrade and turbocharger bearings to wear prematurely. Excessive heat, oil contamination, or worn-out seals cause the turbos to fail. When this happens, owners may notice a loss of power, excessive smoke from the exhaust, or a loud whining noise from the engine bay. Vacuum lines and wastegate actuators also tend to wear out over time, affecting turbo performance.
Why It Happens
The twin-turbocharged V12 generates immense heat, which can cause oil seals to degrade and turbocharger bearings to wear prematurely. Excessive heat, oil contamination, or worn-out seals cause the turbos to fail. When this happens, owners may notice a loss of power, excessive smoke from the exhaust, or a loud whining noise from the engine bay. Vacuum lines and wastegate actuators also tend to wear out over time, affecting turbo performance.
Dealer (parts + labour)
£2,500-£3,500
Specialist (parts + labour)
£1,500-£2,500
What it involves
Replace turbo seals, wastegate actuators, inspect turbo cores
Suitability
40k-70k miles; viable if turbo cores are healthy
1 - 2 daysDealer (parts + labour)
£6,000-£9,000
Specialist (parts + labour)
£4,000-£6,000
What it involves
Replace both turbochargers, new oil lines, gaskets, heat shields
Suitability
70k-100k miles; if turbo failure is confirmed
1 - 2 daysDealer (parts + labour)
£25,000-£35,000
Specialist (parts + labour)
£15,000-£25,000
What it involves
Supply & fit rebuilt M279 V12 with upgraded turbos, new seals
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 - Turbo Seal & Actuator Repair Minor | £2,500-£3,500 | £1,500-£2,500 | Replace turbo seals, wastegate actuators, inspect turbo cores | 40k-70k miles; viable if turbo cores are healthy | 1 - 2 days |
 Major - Twin Turbocharger Replacement Best Value | £6,000-£9,000 | £4,000-£6,000 | Replace both turbochargers, new oil lines, gaskets, heat shields | 70k-100k miles; if turbo failure is confirmed | 1 - 2 days |
Full Replacement - Rebuilt Engine Best Value | £25,000-£35,000 | £15,000-£25,000 | Supply & fit rebuilt M279 V12 with upgraded turbos, new seals | Full long-block warranty; for catastrophic turbo debris ingestion | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical G 65 AMG is worth £80,000-£150,000+ depending on condition and mileage. The full replacement cost of £15,000-£25,000 is small relative to vehicle value, making a specialist rebuilt engine excellent value for preservation. For vehicles worth under £60,000 (high-mileage examples), evaluate repair options first.
Our Recommendation
Our Recommendation
On a G 65 AMG worth £80,000-£150,000+, specialist turbocharger repair at £1,500-£2,500 is the obvious first step if caught early. Dealer pricing is significantly 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 65 AMG
A failed V12 engine doesn't have to mean the end of your G 65 AMG. Whether you're dealing with turbocharger failure, intercooler leaks, ignition coil issues, or oil leaks, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Benz G Class specialists. Every rebuilt M279 V12 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 M279 Mercedes Benz G Class G 65 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 65 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 65 AMG Engine ReplacementFrequently Asked Questions
Question 1How much does it cost to replace a Mercedes G Class G 65 AMG engine in the UK-
A Mercedes G Class G 65 AMG engine replacement typically costs between £15,000 and £25,000 depending on condition type and whether fitting is included. M279 V12 twin-turbo units range from £15,000 to £25,000 supply only.
- Rebuilt M279 V12 (G 65 AMG): £15,000-£25,000 supply only
- Reconditioned units: £12,000-£18,000
- Used engines from breakers: £8,500-£14,000 but higher risk
- Labour for supply & fit adds £1,500-£3,000 to any engine price
Question 2What are the signs of M279 turbocharger failure in a G 65 AMG-
The M279's twin-turbo system has several warning signs before complete failure.
- Loss of power or reduced boost pressure
- Excessive smoke from the exhaust
- Loud whining noise from the engine bay
- Check engine light illuminated
- Fault codes related to turbocharger performance
Question 3Is the M279 V12 engine in the G 65 AMG reliable-
The M279 V12 is a masterpiece of engineering but requires meticulous maintenance. It is generally reliable when properly maintained, but has several well-documented issues.
- Turbocharger failure due to heat and oil contamination
- Intercooler leaks causing reduced boost pressure
- Ignition coil failures due to heat exposure
- Oil leaks from degraded seals and gaskets
- Regular maintenance with correct 0W-40 oil and 5,000-7,000 mile intervals is critical
Question 4Should I repair or replace my G 65 AMG engine-
Repair if the failure is isolated (e.g., turbo seals, ignition coils, intercooler). Replace if there's bottom end damage, bore scoring, or catastrophic turbo failure that has sent debris through the engine.
- Turbo seal/actuator repair: £1,500-£2,500 - excellent value if caught early
- Intercooler replacement: £2,000-£3,000 - essential maintenance
- Ignition coil set replacement: £900-£1,500 - preventative if caught early
- Full M279 V12 rebuild: £15,000-£25,000 - for catastrophic failure or 100k+ miles
- Given G 65 AMG values (£80,000-£150,000+), a rebuilt engine is excellent value
Question 5How do I know which engine code my G 65 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 65 AMG (2012-2018): M279.982 (6.0L V12 twin-turbo)
- Service history documents list engine type
Question 6Can I fit a used G 65 AMG engine myself-
We strongly advise against DIY fitting on a G 65 AMG. The complex 4MATIC system, twin-turbo V12 plumbing, gearbox alignment, and ECU coding requirements demand specialist equipment and expertise.
- 4MATIC transfer case alignment requires specialist knowledge
- Twin-turbo V12 system requires precise reassembly
- ECU coding and immobiliser synchronisation needed
- Specialist supply & fit costs £1,500-£3,000 - essential for a V12 AMG
Question 7What warranty comes with a reconditioned G 65 AMG engine-
Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty, with many specialists offering 24-month coverage on M279 V12 rebuilds. This includes parts and labour for any manufacturing defect or installation error.
- 12-month unlimited mileage is the minimum standard
- M279 V12 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 65 AMG V12Engine PricesToday
100+ AMG V12 engines supplied through our network
12-Month Warranty on every rebuilt G 65 AMG engine
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