The 2021 AMG GT Black Series is a hand-built, track-focused hypercar with a highly-strung 4.0L twin-turbo V8 making 720 hp. These are rarely daily-driven, but when tracked hard or maintained poorly, the engine and drivetrain take brutal punishment that shows up fast.
Connecting Rod Bearing Failure (Track-Driven Cars)
Occasional · high severity
Symptoms: metallic knocking at idle or under load, oil pressure fluctuation, metal shavings in oil filter, sudden catastrophic engine failure if ignored
Fix: Requires engine-out service, crankshaft inspection, rod bearing replacement, full oiling system flush. If caught early, 18-22 hours labor. If spun bearing damaged crank journals, add crankshaft machining or replacement and you're looking at 30-40 hours total.
Estimated cost: $8,000-18,000
Piston Ring Land Cracking / Ringland Failure
Rare · high severity
Symptoms: excessive oil consumption (more than 1 qt per 1,000 mi), white or blue smoke on startup or hard acceleration, misfires under boost, compression loss on cylinder leak-down test
Fix: Forged pistons under extreme boost and heat can crack ring lands, especially with detonation events. Requires engine disassembly, piston replacement (often all eight for balance), honing, and reassembly. 35-45 hours labor, plus machine work.
Estimated cost: $15,000-25,000
Transmission Oil Cooler Line Leaks
Occasional · medium severity
Typical onset: 15,000-30,000 mi
Symptoms: transmission fluid pooling under car, burnt transmission fluid smell, low fluid warning on dash, harsh shifting or slipping if fluid level drops significantly
Fix: High-pressure cooler lines can develop leaks at crimp fittings or from vibration fatigue. Requires lift access, line replacement, system flush, and fluid refill. 4-6 hours labor.
Estimated cost: $1,200-2,200
Transmission Mount Deterioration (Track Use)
Common · medium severity
Symptoms: clunking on hard shifts or launch control, vibration through cabin at idle, drivetrain slop when shifting from Drive to Reverse, visible tearing or oil weeping from mount
Fix: Dual-clutch transmissions with aggressive launch control and track use shred mounts quickly. Replacement requires lifting drivetrain, 3-5 hours labor. OEM mounts only; aftermarket often too stiff for street use.
Estimated cost: $800-1,400
Fuel Filter Clogging (High-Ethanol or Contaminated Fuel)
Occasional · medium severity
Typical onset: 20,000-40,000 mi
Symptoms: rough idle or hesitation under hard acceleration, lean fuel trims on scanner, power loss above 5,000 RPM, check engine light with fuel trim or fuel pressure codes
Fix: In-tank high-pressure filter on these cars is sensitive to fuel quality. Tank must be dropped, pump module removed, filter replaced. 4-6 hours labor. Common on cars tracked frequently with inconsistent fuel sources.
Estimated cost: $900-1,600
Head Gasket Failure (Overboost or Overheating)
Rare · high severity
Symptoms: coolant in oil (milky dipstick), white exhaust smoke, overheating with no external leaks, combustion gases in coolant (bubble test positive), misfires and rough running
Fix: Rare but catastrophic on tuned or over-boosted cars. Requires heads-off service, machine shop inspection for warpage, new gaskets, ARP studs recommended, timing chain reset. 25-35 hours labor plus machine work.
Estimated cost: $12,000-20,000
Owner tips
Change oil every 3,000-5,000 miles if tracked, and send samples to Blackstone or equivalent for bearing wear analysis—early warning is critical on these engines.
Use only top-tier 93+ octane fuel; these engines are extremely knock-sensitive and will grenade pistons with bad fuel or aggressive tunes.
If you track the car, budget for transmission mount replacement every 15-20 track days and inspect rod bearings every 30,000 miles or after any sustained high-RPM use.
Keep detailed service records—these cars are hand-built and each has quirks; MB dealership familiarity with your specific VIN is invaluable for resale.
Buy only if you have a documented service history, an extended warranty you trust, and a $20K rainy-day fund—these are six-figure maintenance machines, not cars.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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Fitment notes: AGM battery required; located in trunk; high-performance spec for twin-turbo V8
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Every control module on the 2021-2023 Mercedes-Benz AMG GT Black Series — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Transmission Control Unit (TCU)2.5 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Transmission housing, driver side of AMG Speedshift DCT 7-speed
🔧 Xentry Diagnostics + SCN online
⚠️ Requires transmission removal for access. VIN-locked, SCN coding mandatory.
Electric Power Steering Control Unit (EPS)2.0 hr R&Rsecurity gateway +0.8 hr▸ programming details
📍 Steering column, integrated with steering rack assembly
⚠️ AMG Performance seats with memory and heating. Memory relearn required.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2022 CLA-Class, GLA-Class, GLE-Class, GLS-Class, SLC-Class, A-Class, AMG GT-Class, C-Class, E-Class, S-Class, SL-Class, GLC-Class, CLS-Class, GLB-Class, and G-Class vehicles. Please refer to MBUSA's recall report for specific vehicle model details. An error in the communication module's SIM card software can cause a mobile network connection failure, disabling the emergency call (eCall) system.
Consequence: A disabled eCall system would prevent a vehicle occupant from contacting the emergency services call center in an emergency, potentially delaying emergency responders and increasing the risk of injury.
Remedy: The communication module software will be updated through an Over-the-Air (OTA) update or by a dealer, free of charge. Owner notification letters were mailed July 8, 2022. Owner notification letters will be mailed in phases, on July 8, 2022, May 17, 2024, July 29, 2024, and September 27, 2024. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's numbers are for this recall is 2022060005 and 2023110006.
ELECTRONIC STABILITY CONTROL (ESC) · 22V042000
2022-01-28
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021 AMG GT Black Series vehicles. The wiring harness for the front wheel speed sensor may be the incorrect length, which could result in damage to the harness during certain driving conditions.
Consequence: A damaged speed sensor wiring harness can impair dynamic control functions, such as stability and traction control, and anti-lock brakes, increasing the risk of a crash.
Remedy: Dealers will replace the wiring harness, free of charge. Owner notification letters were mailed March 18, 2022. Owners may contact MBUSA customer service at 1-800-367-6372.
Performance
Horsepower
720hp
Torque
590lb-ft
0–60 mph
3.1sec
Quarter mile
10.8sec
Top speed
202mph
Fuel economy (EPA)
City
15mpg
Highway
20mpg
Combined
17mpg
Fuel
Premium Gasoline
Capability & size
Curb weight
3,616lb
Seating
2seats
EPA class
Two Seaters
Wiper blades
AMG GT Black Series coupe. No rear wiper on coupe body style.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2021 Mercedes-Benz AMG GT Black Series 4.0L Turbo V8 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years.