Mercedes-AMG G 63 Problems: What Breaks on the W463 and W463A in the UAE

The G 63 is the AMG we see most in Al Quoz — the 5.5 biturbo W463, the 2018+ W463A with the 4.0 and a steady stream of G 55 Kompressors that refuse to die. A G-Class is a ladder-frame truck with live axles and three locking differentials carrying a racing engine, and in Dubai heat each half has its own list of weak points. Owners who know the list drive their G to 200,000 km; owners who treat it like a sedan meet it on a flatbed.

This is what our workshop actually fixes on the G 63 by generation, with labour prices from our Mercedes-Benz repair prices and the notes of Aleksandr Rodichev, our technical director. It continues our guide to common Mercedes-Benz problems in the UAE; the brand-wide points (AC, airmatic on other models, electronics) are there.

G 55 AMG Kompressor (W463, 2004–2011)

Engine M113K 5.4 supercharged V8, 5G-Tronic gearbox. The engine is close to indestructible; the body and the systems around it are twenty years old.

• Central locking, door handles and hinges. Doors that do not lock from the key, handles that stick, a rear door that sags and needs a lift to close — the W463's age shows here first. Hinge adjustment and handle repairs are an afternoon.
• Differential lock actuators and switches. Locks that will not engage or will not disengage, a flashing lock light. On cars that never use the locks the actuators seize; cleaning, new seals and exercised locks fix most.
• Transfer case and axle seals. A whine on the highway and oil on the inside of the wheels; the fluids are usually original. Transfer case oil from 300 AED, differential oil from 300 AED.
• Exhaust manifolds and supercharger coupler. A tick on cold start is a cracked manifold or a broken stud; a rattle from the supercharger is the coupler. Both are known and planned jobs.
• 5G-Tronic conductor plate and fluid. Harsh shifts and a gearbox warning; the fluid and the conductor plate before anything else. Gearbox oil change from 350 AED.
• Rear AC and the blower. The rear unit loses gas and the blower motors wear out; the front AC may be perfect and the rear passengers still hot. AC refill from 200 AED.

G 63 AMG 5.5 biturbo (W463, 2012–2018)

Engine M157 5.5 twin-turbo V8, 7G-Tronic Plus (722.9). The most common G in Dubai and the one with the clearest pattern.

• Oil leaks: valve covers, turbo oil lines, oil cooler lines. A burning smell after a highway run and oil on the turbo heat shields. The valve cover gaskets harden at 80,000–100,000 km in this heat; the turbo lines follow. Valve cover gasket from 150 AED.
• Coolant leaks: thermostat housing, intercooler circuit, pump. The M157 runs two cooling circuits; the low-temperature intercooler pump and its hoses fail quietly and the car loses power on a hot day before it loses coolant. Pressure test from 80 AED; coolant change from 80 AED.
• Collapsed hydraulic engine mounts. A vibration at idle in Drive and a clunk on throttle — the AMG hydraulic mounts give up at 60,000–90,000 km under 760 Nm and 45°C. Replaced in pairs with the gearbox mount checked.
• 7G-Tronic Plus: conductor plate, torque converter, fluid. Harsh 2–1 shifts when hot, a shudder at 50–70 km/h, a gearbox warning. Fluid and adaptations first, conductor plate second, converter last — in that order and only after a scan. Gearbox oil from 350 AED.
• Spark plugs and coils every 20,000 km. Misfires under boost are the first sign; the M157 is unforgiving with old plugs. Spark plugs from 100 AED, ignition coil from 100 AED.
• Exhaust flap actuators and the performance exhaust. A rattle from the back and a flap that stays closed; the vacuum actuators and their lines age in the heat.
• Brakes. Big discs that warp in traffic and pads that go in 20,000–30,000 km of Dubai driving; a shudder from 120 km/h is the sign. Brake pads from 150 AED per axle, discs from 150 AED, brake fluid with bleeding from 350 AED.
• Adaptive dampers and front axle. Leaking adaptive dampers (AMG Ride Control), worn front axle bushings and a steering damper that lets the car wander at speed. Damper replacement from 200 AED.

G 63 4.0 biturbo (W463A, 2018+)

Engine M177 4.0 twin-turbo V8 with the turbos in the V, 9G-Tronic (725.0), independent front suspension for the first time. A far better car to drive; the list is shorter and mostly about the engine's heat.

• Cold-start rattle from the camshaft adjusters (2018–2020 cars). A second or two of chatter on the first start of the day; known on early M177 and M178 engines. We record it, read the adjuster values with XENTRY and look with an endoscope before any decision — engine diagnostics with endoscopy from 500 AED.
• Spark plugs and coils. The hot V and 585 hp mean plugs every 20,000 km here, not 40,000; misfires under boost and a flashing engine light are the sign. Spark plugs from 100 AED.
• Turbo coolant and oil lines in the V. Heat soak cooks the lines and seals between the turbos; a coolant smell after parking and a slowly dropping level are the early signs. Pressure test from 80 AED.
• 9G-Tronic adaptations and fluid. Jerky low-speed shifts and a delayed engagement from Park; adaptation reset and fluid in this heat at 60,000 km, not “lifetime”. Gearbox oil from 350 AED.
• AMG Ride Control dampers and the front axle. Leaking adaptive dampers, front lower-arm bushings and anti-roll bar links on 22-inch wheels; a “Suspension” message and a knock over the speed bumps of Al Quoz.
• MBUX, cameras and battery drain. Screens that reboot, a 360 camera that drops out, a battery flat after a week — mostly software, connectors and aftermarket accessories. Electrical diagnostics from 100 AED.
• Brakes and tyres. 400 mm discs that warp in traffic and 22-inch tyres that wear the inside edge if the alignment is off. Pads from 150 AED, two-axis alignment from 200 AED.
• Differential locks, still. Three locks are still there, still electric, still seizing when never used. We exercise them at every service.

What every G-Class brings: axles, locks, brakes, AC

What G 63 repairs cost at Golden Horse

Labour from our Mercedes-Benz repair prices, excluding 5% VAT; parts are quoted separately with genuine Mercedes and OEM options — you see the price before any work starts. A G 63 takes more oil, bigger plugs and bigger discs than a C-Class, so parts matter more than labour here.

• Electrical diagnostics — from 100 AED; engine diagnostics with endoscopy — from 500 AED
• Cooling system diagnostics — from 80 AED; coolant change — from 80 AED; radiator replacement — from 250 AED; cooling fan motor — from 200 AED
• Oil and filters — from 200 AED; gearbox oil — from 350 AED; transfer case oil — from 300 AED; differential oil — from 300 AED
• Valve cover gasket — from 150 AED; spark plugs — from 100 AED; ignition coil — from 100 AED; engine “attachments” (alternator, starter) — from 150 AED
• Dampers — from 200 AED; control arms — from 150 AED per pair; stabilizer links — from 100 AED; steering rods — from 150 AED
• Brake diagnostics — from 100 AED; brake pads — from 150 AED per axle; discs — from 150 AED; brake fluid with bleeding — from 350 AED
• AC refill — from 200 AED; AC disinfection — from 150 AED; two-axis alignment — from 200 AED

Golden Horse Mercedes-Benz expert

How to keep a G 63 healthy in Dubai

1. Oil every 8,000 km and plugs every 20,000 km. Both AMG V8s punish owners who stretch intervals in this heat; a misfire under boost is already late.
2. Coolant and a pressure test every year, including the intercooler circuit on the M157. Power loss on a hot day is a cooling problem before it is an engine problem.
3. Gearbox, transfer case and both differentials every 60,000 km. Four fluids, one visit; it is the cheapest insurance a G owner can buy.
4. Engage every lock once a month on a dirt track or an empty car park, for a hundred metres. Locks that move do not seize.
5. Brakes and alignment after every set of tyres. 22-inch wheels on a 2.5-tonne truck need a straight alignment print and discs without runout.
6. Battery test every spring and a look at any aftermarket wiring — half the random warnings on a G are a weak battery or a dash-cam install.

Why owners bring their G 63 to Golden Horse. Mercedes-Benz and AMG are the cars our workshop in Al Quoz was built around: XENTRY diagnostics for every module, genuine Mercedes and OEM parts with the price shown before any work, a warranty on all work, same-day slots for diagnostics and a technical director who started as an engine mechanic. Owners come to us from the dealer for the second opinion and stay for the prices.

When to book

A rattle on the first start of the day, a burning-oil smell after the highway, a coolant top-up every month, a vibration at idle in Drive, a shudder at 50–70 km/h, a lock light that flashes, a shudder when braking from speed or a rear AC that stays warm: these are the early signs, and early on a G 63 they are a planned job rather than a tow. Send the year, engine and symptom to WhatsApp and our Mercedes expert will reply with a first assessment; diagnostics in Al Quoz takes about an hour. Golden Horse Car Service, Al Quoz Industrial Area 3, Mon–Sat 10:00–20:00; pickup and delivery across Dubai on request. All Mercedes-Benz weak points, not only the G-Class: Common Mercedes-Benz problems in the UAE.