Mercedes GL 2012 3.0 diesel service and maintenance

Engine oil

Engine oil capacity: 8.8 litres (9.3 quarts)
Oil change interval is 10,000 km or one year, whichever comes first.
Recommended oil type (Oil Viscosity Classification SAE) is 5W-30 and the oil must comply with the manufacturer's specification MB 228.51/229.51

Air filter

Replacement interval for the air filter is 10,000 km.
After prolonged driving in particularly dusty conditions, it is advisable to check the condition of the air filter earlier and replace it if the filter is visibly dirty.

Fuel filter

Mercedes GL 3.0 diesel fuel filter replacement interval: 30,000 km

Glow plugs

Glow plugs change interval is 90,000 km.

Timing chain

There is no manufacturer specified replacement interval for the engine timing chain on Mercedes GL 2012 3.0 diesel, expecting it to last until the engine is overhauled.
Based on real life experience, the Mercedes GL 2012 350 2012 BlueTec 4Matic timing chain change interval is approximately 400,000 km as at this mileage it may become overstretched and require replacement, so it is recommended to check the condition of the chain periodically after this mileage is reached and replace the timing chain if it becomes excessively stretched or if unusual engine noises occur.

Serpentine (drive) belt

Mercedes GL 2012 350 2012 BlueTec 4Matic serpentine or alternator belt replacement interval is 90,000 km.

Engine coolant

Engine coolant (antifreeze) recommended replacement interval for Mercedes GL 3.0 diesel is 90,000 km or 5 years, whichever comes first.