Service A / Service B
About 25,000 km or 1 year (ASSYST)
25 000 km
12 months
Oil and filter at each service; Service B adds filters and wider checks. The ASSYST indicator prevails.
Source [1]X166 · 2015–2019
Mercedes GLS GLS 500 4MATIC X166 · 455 hp (2015 to 2019)
The Mercedes GLS GLS 500 4MATIC of the X166 generation uses the M278 4.7 V8 petrol engine with 455 hp.
Choose an engine
Identify the car and prepare its maintenanceTechnical specifications
- Fuel
- Petrol
- Power
- 455 PS / 335 kW
- Displacement
- 4 663 cm³
- Cylinders
- 8
- Engine code
- M278 4.7 V8
- Period covered
- 2015–2019
- Documented market
- Europe
Transmission
- Automatic · 9 speeds
Figures apply to the cited configuration and market; equipment and transmissions may vary by production date.
Specification source : [1] AutoKarnet
This version
455 hp (335 kW), 4MATIC all-wheel drive, 9-speed automatic. Built from 2015 to 2019.
AutoKarnet advice
In the range
It is the most powerful petrol version of this generation. The M278 4.7 V8 engine is also fitted to: Mercedes Classe E (W212), Mercedes CLS (C218), Mercedes Classe S (W221), Mercedes Classe S (W222), Mercedes GLE / ML (ML / GLE W166), Mercedes SL (R231).
AutoKarnet advice
Maintenance and records
Brake fluid
Every 24 months
24 months
Time-based replacement, whatever the mileage.
Source [1]Questions about this version (2)
Which engine is in the Mercedes GLS GLS 500 4MATIC X166?
The M278 4.7 V8 petrol engine (4 663 cc), 455 hp (335 kW).
AutoKarnet advice
Which oil for the Mercedes GLS GLS 500 4MATIC?
A MB 229.5 / 229.51 / 229.52-approved oil suited to the M278 4.7 V8 engine.
AutoKarnet advice
Documentary sources
- [1] Rédaction AutoKarnet
AutoKarnet · FR · Europe · Synthèse éditoriale AutoKarnet · Accessed 09/10/2026