Page 366 of 457
365 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
±Certain electronic systems are unable to 
relay information to the control system. 
The following systems may have failed:
Coolant temperature display
Tachometer
Cruise control display
Have the electronic systems checked 
at an authorized Mercedes-Benz Light 
Truck Center.
[Clean
fuel filterContact an authorized Mercedes-Benz 
Light Truck Center as soon as possi-
ble.
WTop up
washer fluidThe fluid level has dropped to 
about1/3of total reservoir capacity.
Add washer fluid (page 275). 
     
        
        Page 424 of 457
423 Technical data
Fuels, coolants, lubricants, etc.
ModelCapacityFuels, coolants, lubricants, etc.
Engine with oil filterG 500
G55AMG8.5 US qt (8.0 l)
9.0 US qt (8.5 l)Approved engine oils
Automatic transmission9.0 US qt (8.5 l)MB Automatic Transmission Fluid
Transfer case2.96 US qt (2.8 l)MB part no. A 001 989 28 03 10
Differential lock mechanism0.47 - 0.63 US qt (0.45 - 0.6 l)Brake fluid DOT 3+4, SAE J 1703
Front axleG 500
G55AMG1.5 US qt (1.4 l)
1.5 US qt (1.4 l)Hypoid gear oil SAE 85W-90
Hypoid gear oil Castrol SAF-XJ
Rear axleG 500
G55AMG1.9 US qt (1.8 l)
1.9 US qt (1.8 l)Hypoid gear oil SAE 85W-90
Hypoid gear oil Castrol SAF-XJ
Power steeringapprox. 1.06 US qt (1.0 l)MB Power Steering Fluid, or
approved Dexron III ATF
Front wheel hubsapprox. 1.5oz (43g) eachHigh temperature roller bearing grease
Brake system0.86 US qt (0.81 l)MB Brake Fluid (DOT 4+) 
     
        
        Page 426 of 457

425 Technical data
Fuels, coolants, lubricants, etc.
Engine oils
Engine oils are specifically tested for their 
suitability in our engines and durability for 
our service intervals. Therefore, only use 
approved engine oils and oil filters 
required for vehicles with Maintenance 
System (U.S. vehicles) or FSS (Canada 
vehicles). For a listing of approved engine 
oils and oil filters, refer to the Factory 
Approved Service Products pamphlet 
(USA only), or contact an authorized 
Mercedes-Benz Light Truck Center.
Engine oil additives
Air conditioning refrigerant
R-134a (HFC) refrigerant and special PAG 
lubricating oil are used in the air condition-
ing system.
Brake fluid
Only brake fluid approved by 
Mercedes-Benz is recommended. Any 
authorized Mercedes-Benz Light Truck 
Center will provide you with additional 
information.
!Using engine oils and oil filters of specifi-
cation other than those expressly required for 
the Maintenance System (U.S. vehicles) or FSS 
(Canada vehicles), or changing of oil and oil filter 
at change intervals longer than those called for 
by the Maintenance System (U.S. vehicles) or 
FSS (Canada vehicles) will result in engine 
damage not covered by the Mercedes-Benz 
Limited Warranty.Please follow Maintenance System 
(U.S. vehicles) or FSS (Canada vehicles) 
recommendations for scheduled oil changes. 
Failure to do so will result in engine damage not 
covered by the Mercedes-Benz Limited 
Warranty.
!Do not blend oil additives with engine oil. 
They may damage the engine.
Damage or malfunctions resulting from blending 
oil additives are not covered by the 
Mercedes-Benz Limited Warranty.
!Never use R-12 (CFC) or mineral-based 
lubricating oil. Otherwise damage to the system 
will occur.
Warning!G
During vehicle operation, the boiling point of 
the brake fluid is continuously reduced 
through the absorption of moisture from the 
atmosphere. Under extremely strenuous 
operating conditions, this moisture content 
can lead to the formation of bubbles in the 
system, thus reducing the system’s 
efficiency.
Therefore, the brake fluid must be replaced 
regularly. Refer to your vehicle’s 
Maintenance Booklet for replacement 
interval.