Lot 11993C-1: 2014 Mercedes-Benz E63 AMG S 4MATIC

Great question! The 2014 Mercedes-Benz E63 AMG S 4MATIC is a phenomenal performance machine, but like any complex high-performance vehicle, it has some known issues to watch out for—especially with the M157 5.5L twin-turbo V8 under the hood.

M157 Engine-Related Issues

The M157 is a beast, but here are the most common problems:

1. Oil Leaks

• Valve cover gaskets and timing chain area seals can deteriorate over time
• Signs: oil spots under the car, burning oil smell
• Solution typically involves replacing gaskets/seals

2. Turbocharger Problems

• Can fail due to insufficient lubrication or oil contamination
• Symptoms: loss of power, excessive exhaust smoke, whining noises
• Regular oil changes with high-quality synthetic oil are crucial

3. Carbon Buildup on Intake Valves

• Common in direct-injection engines
• Symptoms: rough idling, poor acceleration, reduced fuel efficiency
• Walnut blasting is the typical fix; an oil catch can can help prevent future buildup

4. Oil/Coolant Cross-Contamination ⚠️

• A failing rubber seal between the timing case and block can cause this
• Major red flag—can lead to catastrophic engine damage if not addressed
• Check for oil in the coolant reservoir

5. Cooling System Weak Points

• Plastic water pump pulley can misalign
• Plastic turbo coolant lines prone to splitting (consider upgrading these proactively!)
• Expansion tank and other plastic components can fail with age

6. Cam Phaser & Timing Chain Issues

• Can cause rattling on startup
• Upper timing chain tensioner may stick

7. Bore Scoring/Piston Failure (Early Engines)

• Early M157s used coated aluminum bores which could suffer bore scoring
• Later models switched to cast-iron liners
• Can necessitate full engine replacement in worst cases

Transmission Issues

The AMG Speedshift MCT 7-speed is generally robust, but watch for:

• Delayed engagement or rough shifting (especially at low speeds)
• Transmission overheating warnings
• Conductor plate (transmission control module) failure
• Torque converter problems in higher-mileage cars

Regular transmission fluid and filter changes are essential for longevity.

Air Suspension & Driveline

• Airmatic rear air springs can leak, causing the rear to sag
• Differential whine from worn bearings
• Driveshaft vibration at certain speeds
• Control arm bushing wear leading to clunking noises

Electrical Gremlins

• Command infotainment system freezes or unresponsive controls
• Bluetooth connectivity issues
• Battery drain from parasitic draws
• Electronic parking brake malfunctions

Other Known Issues

• Panoramic roof creaking (common, often fixable DIY)
• SBC (Sensotronic Brake Control) system failures—check if any recalls apply
• Catalytic converter clogging/failure
• Interior trim wear and rattles as the car ages
• Carbon ceramic brakes (if equipped) are outrageously expensive to replace—stick to standard brakes unless you’re tracking the car!

The Bottom Line

With 83,905 miles on this particular car, I’d pay special attention to:

• Service history (has it had regular oil changes with quality synthetic oil?)
• Any signs of oil in the coolant
• Transmission behavior on test drives
• Air suspension function
• Recent cooling system service

The M157 can be reliable if well-maintained, but neglected examples can become very expensive very quickly. Budget $3,000–6,000 annually for maintenance worst-case, and definitely get a pre-purchase inspection from an AMG specialist!

Want me to help you find similar E63 AMGs currently for sale, or do you have questions about any specific aspect of this car?

Sources: Euro Auto Pro, ReDriven