Mercedes-AMG GT X290 Engines — The Complete UK Guide
Every engine fitted to the AMG GT four-door coupé — from the electrified straight-six M256 to the thunderous M177 V8 that defines AMG's modern era. Real UK replacement costs, honest reliability data, and the hybrid V8 that rewrote the rulebook. Backed by 370+ real UK M177 enquiries in 2025 [MB-VERIFIED].
Explore X290 Engines
Mercedes-AMG GT X290 Engine Codes — The Complete Database
Every engine fitted to the X290 four-door coupé — from the 367bhp mild-hybrid straight-six to the 843bhp plug-in hybrid V8.
Overview
Mercedes-AMG GT X290 — Overview
The X290 is the four-door liftback variant of the Mercedes-AMG GT range, introduced in 2018 as a five-door executive express that shares its MRA platform with the E-Class.
It marked AMG's first four-door coupé, combining the brand's racing DNA with genuine practicality — and, from 2021, the most powerful production Mercedes-AMG ever made in the 843bhp GT 63 S E Performance.
Key Facts
Platform
Mercedes-Benz MRA (Modular Rear Architecture)
Predecessor
Mercedes-AMG CLS 63 (C218)
Successor
— (still in production)
Sibling body styles in this generation
None (X290 is a standalone four-door model; two-door AMG GT is C190/R190)
Market Intelligence
The M177 V8 engine generated 370 real UK enquiries in 2025 [MB-VERIFIED], concentrated on GT 63 and GT 63 S variants as these high-performance models exit warranty.
Best & Worst Engines
Best Diesel Overall
Omitted
“no diesel engine fitted to the X290.”
Who it's for:
Best Petrol Overall
M177.980 (GT 63, 585 bhp)
“The 4.0-litre twin-turbo V8 that defines AMG's modern era — hot-vee layout, responsive delivery, and a soundtrack that justifies the premium. Oil leaks from valve covers and coolant system issues are its known weak points, but the underlying engine is robust.”
Who it's for: buyers who want V8 theatre without the hybrid system's complexity.
Highest Risk
M256.930 (GT 43/53, 367/435 bhp)
“The electrified straight-six is clever engineering, but the 48V EQ Boost system adds complexity beyond a conventional engine — starter-generator and auxiliary battery failures are emerging as the primary concerns.”
Who it's for: buyers who prioritise efficiency and accept the hybrid system's long-term costs.
Most Expensive Failure
M177.880 (GT 63 S E Performance)
“The plug-in hybrid V8 combines the M177's complexity with a 150 kW electric motor and 4.8 kWh battery. Two powertrains mean two sets of failure points — and the highest replacement cost in the range.”
Who it's for: buyers who want the ultimate AMG and have the budget to maintain it.
Best Value
M177.980 (GT 63, 585 bhp)
“The entry-level V8 X290 offers the same core engine as the GT 63 S, with slightly less power but the same character — and significantly lower acquisition and maintenance costs than the hybrid flagship.”
Who it's for: buyers who want V8 performance without the hybrid premium.
Most Overlooked
M256.930 (GT 53, 435 bhp)
“The higher-output straight-six offers genuine performance (4.5s to 60mph) with better fuel economy than any V8 — and avoids the M177's hot-vee heat management entirely. It's the sensible AMG.”
Who it's for: buyers who want AMG credentials with running costs that won't shock.
Mercedes-AMG GT X290 — Ownership Economics
The X290 rule
A £6,000–£10,000 M177 recon against a £40,000+ X290 sits at 15–25% of the car's value — comfortably within our 70% Mercedes-Benz threshold. Even the £9,000–£15,000 plug-in hybrid recon is only 20–35% against a £45,000+ example. These are not cheap cars to run, but the economics work — provided you buy well and maintain diligently.
Key Takeaways
Which X290 Costs Least To Own?
GT 53 (M256.930) — better fuel economy, lower parts costs than the V8.
Which X290 Costs Most To Own?
GT 63 S E Performance — hybrid V8 complexity and battery replacement risk.
Which X290 Is Best Value?
GT 63 (M177.980) — V8 character without the hybrid premium.
Common Problems
X290 Engine Replacement Costs — By Engine and Condition
No Generation variance from the baseline figures — the X290 four-door shares its MRA platform with the E-Class, and engine-bay access is consistent across the range. M177 costs are inherited from the EM data's M177 line (£6,000–£10,000 reconditioned); M256 costs are estimated from the broader premium V6/straight-six replacement market.
Core Variants
Core Variants
Scope note: All variants listed are X290 four-door liftback only. The two-door AMG GT (C190/R190) is a separate model with different chassis and should not be confused with this generation.
Market Intelligence
Most Requested E90 Engines (2025)
- 1.1. M177.980 (GT 63/63 S) — 370 [MB-VERIFIED]
- 2.2. M256.930 (GT 43/53) — pattern data
- 3.3. M177.880 (GT 63 S E Performance) — pattern data
Most Requested E90 Variants
- 1.1. GT 63 4MATIC+
- 2.2. GT 63 S 4MATIC+
- 3.3. GT 53 4MATIC+
Average E90 Replacement Cost
£3,000–£15,000 [MB-QUOTE]
Most Common E90 Failures
- 1.1. M177 valve cover oil leaks
- 2.2. M256 48V EQ Boost system failures
- 3.3. M177.880 hybrid system complexity
Mercedes-AMG GT 63 (M177)
5
enquiries
Mercedes-AMG GT 53 (M256)
3
enquiries
Mercedes-AMG GT 63 S E Performance
2
enquiries
FAQ
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covering every variant from GT 43 to GT 63 S E Performance, with supply‑only or full supply‑&‑fit available nationwide.
Find the best Mercedes-AMG GT X290 engine replacement UK drivers rely on. Compare real prices from trusted specialists on EnginesMarket today — whether you need a straight‑six, a thunderous V8, or the plug‑in hybrid, we'll get you back on the road with confidence.
