Mercedes-Benz G-Class W463 Engines — The Complete UK Guide
Every engine fitted to the second-generation G-Class W463 — from the 3.0-litre straight-six diesel to the 4.0-litre twin-turbo V8 monsters. Real UK costs, honest reliability data, and the M177 that defines the AMG legend. Backed by real UK enquiries in 2025 [PATTERN DATA].
Explore W463 Engines
Mercedes-Benz G-Class W463 Engine Codes — The Complete Database
Every engine fitted to the second-generation W463 specifically — from the entry-level G 350 d diesel through to the range-topping AMG G 63.
Overview
Mercedes-Benz G-Class W463 — Overview
The second-generation Mercedes-Benz G-Class W463, introduced in 2018, represents the most comprehensive overhaul in the G-Wagen's history.
While retaining its iconic boxy silhouette and body-on-frame construction, the W463 brought a completely revised chassis, a new front axle, improved aerodynamics, and a significantly upgraded interior. The engine range was equally transformed — the naturally aspirated and older turbocharged V8s gave way to modern twin-turbo units: the M176 4.0-litre V8 in the G 500 (422 bhp), the AMG-tuned M177 in the G 63 (585 bhp), and the all-new OM656 3.0-litre straight-six diesel in the G 350 d (249 bhp) and G 400 d (330 bhp). The 500,000th G-Class unit — a special one-off model — was built in April 2023, marking the model's enduring success.
Key Facts
Platform
Mercedes-Benz W463 (second generation, 2018–2024)
Predecessor
W463 (first generation, 1990–2018)
Successor
W465 (2024–present)
Sibling body styles in this generation
None (five-door SUV only)
Market Intelligence
The W463 G-Class attracts strong specialist interest in the UK used market, with M176 V8 and OM656 diesel enquiries dominating pre-purchase inspections and high-mileage maintenance planning [PATTERN DATA].
Best & Worst Engines
Thin-Data Summary
“Thin-Data Fallback mode applied — compressed to a single paragraph. Best & Worst Engines: The W463's engine range is tightly focused but every unit is exceptional. At the top for everyday usability sits the OM656 3.0-litre straight-six diesel — the G 400 d (330 bhp) offers effortless torque (700 Nm), strong economy and proven durability, making it the most sensible G-Class for daily driving. The G 350 d (249 bhp) is a more affordable entry point but still delivers the same robust OM656 architecture. Among petrols, the M176 4.0-litre V8 in the G 500 (422 bhp) is smooth, refined and benefits from cylinder deactivation for improved efficiency — it's the pick for buyers who want V8 character without AMG running costs. The M177 in the AMG G 63 (585 bhp) is a masterpiece — brutal, addictive and genuinely quick for a 2.5-tonne SUV — but it demands deeper pockets for fuel, tyres and specialist maintenance. For most buyers, the G 400 d represents the sweet spot between capability, economy and running costs. Who it's for: buyers who want the sweet spot between G-Class presence and running-cost sanity.”
Who it's for:
Mercedes-Benz G-Class W463 — Ownership Economics
The W463 rule
A £6,000–£10,000 M176 recon against a £40,000–£80,000 W463 sits at just 7.5–25% of the car's value — well within Mercedes-Benz's 70% threshold. Even a £10,000–£14,000 M177 recon on a £60,000–£100,000 AMG G 63 sits at 10–23%. The G-Class's extraordinary retained values mean engine replacement is almost always financially viable. For OM656 diesels, the economics are even more favourable — a £5,000 recon on a £45,000 example is just 11%. Value the car, but know that the G-Class holds its value like almost nothing else on the road.
Key Takeaways
Which W463 Costs Least To Own?
G 350 d (OM656) — excellent fuel economy, lower entry price.
Which W463 Costs Most To Own?
AMG G 63 (M177) — extreme performance, extreme running costs.
Which W463 Is Best Value?
G 400 d — the sweet spot between performance and running costs.
Common Problems
W463 Engine Replacement Costs — By Engine and Condition
Market Intelligence
Most Requested E90 Engines (2025)
Most Requested E90 Variants
Average E90 Replacement Cost
Most Common E90 Failures
FAQ
Why UK Mercedes-Benz G-Class W463 Owners Trust MercedesEngines.uk
Trusted W463 Engine Suppliers
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UK Engine Replacement Services for W463
covering every variant from G 350 d to AMG G 63, with supply-only or full supply-&-fit available nationwide from 25+ vetted Mercedes specialists.
Find the best Mercedes-Benz G-Class W463 engine replacement UK drivers rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.
