Mercedes-Benz 2005 E 320 Operator's Manual page 302

Operation
At the gas station
Warning!
Overfilling of the fuel tank may create pres-
sure in the system which could cause a gas
or diesel fuel discharge. This could cause
the gasoline or diesel fuel to spray back out
when removing the fuel pump nozzle, which
could cause personal injury.
Replace the fuel cap by turning it to the
right.
You will hear when the fuel cap is tight-
ened.
Close the fuel filler flap.
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Leaving the engine running and the fuel
cap open can cause the yellow fuel
tank reserve warning lamp to flash and
the ? malfunction indicator lamp
(USA only) or the ± malfunction in-
dicator lamp (Canada only) to illumi-
nate.
See also "Practical hints" section
( page 362).
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Gasoline engine:
Only use premium unleaded gasoline
with a minimum Posted Octane Rating
of 91 (average of 96 RON/86 MON).
Information on gasoline quality can
normally be found on the fuel pump.
For more information on gasoline, see
the Factory Approved Service Products
pamphlet.
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Diesel engine:
Only use commercially available vehic-
ular diesel fuels No. 2 or No. 1 (ASTM
D975 No. 2-D or No. 1-D). Information
on diesel quality can normally be found
on the fuel pump.
For more information on diesel fuels,
refer to the Factory Approved Service
Products pamphlet.
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Diesel engine:
If you have driven the vehicle until the
tank is empty, the fuel system needs to
be bled ( page 432).