Fixing a Broken $136k Mercedes GLS63 AMG for $18: Boost Leaks, Oil Leaks & Engine Mounts

Initial Assessment and Diagnosis

• 💡 The 2018 Mercedes-Benz GLS63, with an original MSRP of $136,000, was purchased for a mere $21,000 due to significant issues.
• 🔍 The primary problems identified were a massive oil leak and a low boost situation indicated by a check engine light, potentially pointing to turbocharger failure.
• 🚀 Despite the issues, the car was confirmed to drive and shift through gears, with a surprisingly clean interior and numerous luxury options.

Addressing the Low Boost Issue

• 🛠️ Diagnostic scans revealed turbocharger pressure circuit sensor B under boost codes, confirming the low boost problem.
• 💨 A smoke test identified a loose intake pipe clamp and an unplugged sensor as the likely culprits for the boost issue, surprisingly fixing it for free.
• ⚠️ Initial concerns about wastegate actuator issues were alleviated after consulting with a mechanic and observing minimal play in the flappers.

Tackling the Oil Leak

• 🔍 The source of the oil leak was traced to a flat and hard O-ring on the oil thermostat plug, a relatively inexpensive fix costing only $18.
• 🔧 Accessing the plug required removing several components, including the engine fan and thermostat housing, highlighting the complexity of working on this vehicle.

Engine Mount Replacement and Other Repairs

• ⚙️ Collapsed engine mounts were identified as another significant issue, requiring the engine to be jacked up for replacement.
• 🔩 The process of replacing the engine mounts was described as extremely difficult and time-consuming, involving extensive disassembly from both the top and bottom.
• 💧 A coolant sensor O-ring was also found to be in rough shape, contributing to a coolant leak that was repaired with a new sensor and O-ring.
• 💨 The vehicle underwent a coolant system vacuum test and refill, and the exhaust system was reinstalled after all repairs.

Performance and Conclusion

• ✅ After repairs, the GLS63 demonstrated significantly improved performance, with 0-60 mph times of 4.7 seconds (solo) and 5.4 seconds (with four passengers), indicating a fully functioning boost system.
• 🌟 The car's luxurious interior, powerful V8 engine, and overall condition were praised, despite the extensive repairs needed.
• 🔧 The owner plans further modifications and maintenance to make the vehicle