2022 MERCEDES-BENZ AMG GT

Typical onset: 15,000-50,000 mi

Symptoms: Metallic knocking or ticking at idle that worsens under load, Oil pressure fluctuations or low pressure warning, Metal fragments in oil during analysis, Sudden catastrophic failure with loss of power and severe internal noise

Fix: This is the nightmare scenario. Rod bearings wear prematurely due to oiling issues or manufacturing tolerances. Requires complete engine-out teardown, crank inspection/machining, new bearings throughout, typically 35-50 labor hours. Many shops recommend full short block replacement given the labor involved and risk of collateral damage. Mercedes has issued TSBs but no official recall as of 2024.

Estimated cost: $18,000-35,000

Typical onset: 20,000-60,000 mi

Symptoms: Excessive oil consumption (1 quart per 1,000 miles or worse), Blue smoke on cold start or under hard acceleration, Loss of compression in one or more cylinders, Rough idle and misfires with related fault codes

Fix: Primarily affects early M178 engines; rings lose tension or pistons develop stress cracks. Diagnosis requires leakdown/compression testing and borescope inspection. Repair involves engine removal, head removal, cylinder honing or boring if scored, new piston/ring sets, 40-60 hours labor. Often combined with bearing inspection while it's apart.

Estimated cost: $15,000-28,000

Typical onset: 30,000-70,000 mi

Symptoms: Transmission fluid spots under vehicle near front, Transmission overheat warnings on spirited drives or track days, Fluid level low warnings on instrument cluster, Burnt transmission fluid smell

Fix: The external oil cooler lines and cooler housing develop leaks from vibration and heat cycles. Requires dropping undertray, draining DCT fluid, replacing cooler assembly and lines, refilling with correct Mercedes DCT fluid, 4-6 hours labor. Must use genuine MB fluid or approved equivalent.

Estimated cost: $1,200-2,200

Typical onset: 25,000-60,000 mi

Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive driveline vibration at idle in gear, Harsh shift engagement, especially when cold, Visible transmission movement or torn rubber on inspection

Fix: The DCT transmission mounts wear from the aggressive torque delivery and launch control abuse. Straightforward replacement on a lift with transmission support, typically both mounts done simultaneously, 3-4 hours labor. Use OEM or high-quality aftermarket like Lemförder.

Estimated cost: $800-1,400

Typical onset: 40,000-80,000 mi

Symptoms: Hesitation or stumbling under wide-open throttle, Limp mode activation under hard acceleration, Fuel pressure too low fault codes (P0087), Rough running at high RPM

Fix: The high-pressure fuel system is sensitive to contamination. Main filter is integral to the fuel pump assembly in the tank, requiring tank drop and pump module replacement. Not a simple spin-on canister filter job. 6-8 hours labor, must use OEM parts due to tight fuel pressure specifications for direct injection turbo application.

Estimated cost: $1,500-2,800

Typical onset: 50,000-90,000 mi

Symptoms: Overboost or underboost fault codes, Reduced power and limp mode activation, Whistling or fluttering sounds from engine bay under boost, Check engine light with boost control deviation codes

Fix: The electronic wastegate actuators on both turbos can stick from carbon buildup or mechanical wear. Diagnosis requires boost pressure testing and actuator function checks. Individual actuator replacement possible but often leads to replacing entire turbo assembly due to labor involved in accessing them. Each side requires 8-12 hours with exhaust manifold and turbo removal.

Estimated cost: $3,500-7,000