2019 Mercedes-Benz GLS Pre-Purchase Inspection Checklist
Known Issues — 2019 Mercedes-Benz GLS
CRITICAL
AIRMATIC air spring and compressor failure on aging examples
CRITICAL
7G-Tronic conductor plate failure leading to limp mode
MODERATE
Transfer case leaks disabling AWD on high-mileage examples
MODERATE
GLS63 V8 oil leaks from timing cover and valve covers
MODERATE
Rear differential bearing noise under load
MODERATE
Panoramic sunroof drain blockage causing interior leaks
What to Inspect
- Inspect all four air suspension corners — park overnight and check in morning
- Scan 7G-Tronic for conductor plate codes
- Inspect transfer case and rear differential for oil seeps
- Listen for differential bearing noise under acceleration at 20-50 mph
- Check panoramic roof drain tubes and headliner for moisture
- Check GLS63 engine top for oil leaks
Expected Maintenance Costs
| Service | Interval | Cost |
|---|---|---|
| Service A (oil & filter) | every 10,000 miles | $350-$500 |
| Service B (full inspection) | every 20,000 miles | $800-$1,200 |
| Air spring replacement (each) | as needed | $1,000-$1,800 |
| Transmission conductor plate | as needed | $1,000-$1,800 |
| Brake pads and rotors (front) | every 25,000-35,000 miles | $900-$1,400 |
| Rear differential fluid service | every 40,000 miles | $250-$450 |
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