Description
Factory Mercedes GLS Class GLS350d 4Matic Workshop Manual (2015–2019)
This is the official factory-level service manual for the Mercedes-Benz GLS350d 4Matic, covering every X166-chassis example built from 2015 through 2019 — the complete first generation of the GLS nameplate in the US market.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | N/A |
| Diesel | OM642 3.0L V6 bi-turbodiesel (~258 hp / 620 Nm) |
| Transmissions | 9G-TRONIC 9-speed automatic |
| Drive | 4Matic full-time AWD |
| Model Years | 2015–2019 |
| Badge Twins | Mercedes-Benz GL350 BlueTEC (pre-2016 rebrand, X166 chassis) |
Common GLS350d Repairs Covered
| System | Procedures |
|---|---|
| OM642 Diesel Fuel System | Swirl flap removal and blanking (known OM642 failure point), injector removal and re-coding, high-pressure fuel pump service |
| AIRMATIC Air Suspension | Compressor replacement, strut/bag replacement, ride-height sensor calibration, valve block diagnostics |
| 9G-TRONIC Transmission | Fluid and filter service, mechatronic unit fault diagnosis, valve body inspection, transfer case fluid change |
| Cooling System | Thermostat housing replacement, coolant flush procedure, EGR cooler inspection, water pump service |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
What is the known swirl flap issue on the OM642 engine, and does this manual cover it?
The OM642 3.0L V6 diesel used in the GLS350d is well-documented for swirl flap failures — the plastic actuator arms can break and drop debris into the intake manifold, potentially causing serious engine damage. This manual includes complete intake manifold removal and reinstallation procedures, swirl flap assembly detail, and torque specs, giving you everything needed to carry out a proper repair or preventive blanking plate installation.
Is the X166 GLS350d the same platform as the GL350 BlueTEC?
Yes. Mercedes rebranded the GL Class as the GLS Class for the 2017 model year in the US market, but the underlying X166 platform, OM642 engine, and 9G-TRONIC transmission carried over unchanged. This manual covers all X166 GLS350d 4Matic production from 2015 through 2019, including vehicles originally sold as GL350 BlueTEC under the pre-rebrand naming convention.
Does this manual include AIRMATIC air suspension diagnostics?
Yes. The GLS350d 4Matic was equipped with Mercedes’ AIRMATIC adaptive air suspension as standard. The manual covers compressor testing and replacement, individual air strut and bag service, ride-height sensor calibration, and valve block fault diagnosis — all critical procedures given how commonly AIRMATIC components require attention on high-mileage X166 examples.
What format is the manual?
This manual is delivered as a PDF file. After purchase, you receive an instant download link and retain lifetime access for re-downloads. The file is fully searchable and compatible with Windows, Mac, tablets, and smartphones.
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