2017 Mercedes-Benz GLS Pre-Purchase Inspection Checklist
Known Issues — 2017 Mercedes-Benz GLS
CRITICAL
AIRMATIC air suspension compressor failure — very costly out of warranty
CRITICAL
Air spring bladder cracking causing suspension sag on one or more corners
CRITICAL
7G-Tronic transmission conductor plate failure causing erratic shifts
MODERATE
Transfer case oil seal leaks disrupting 4MATIC AWD
MODERATE
GLS63 AMG M157 V8 oil leaks from front timing cover
MODERATE
Panoramic sunroof water leak from clogged drain tubes
What to Inspect
- Park vehicle overnight and inspect all four air suspension corners in morning
- Listen for air compressor cycling frequently — indicates failing springs
- Scan transmission for conductor plate fault codes
- Inspect transfer case output seals for oil leaks
- Inspect GLS63 front engine area for oil seeps
- Check panoramic sunroof drain tubes and headliner
Expected Maintenance Costs
| Service | Interval | Cost |
|---|---|---|
| Service A (oil & filter) | every 10,000 miles | $350-$500 |
| Service B (full inspection) | every 20,000 miles | $750-$1,100 |
| 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 |
| Transfer case service | every 40,000 miles | $300-$500 |
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