Mercedes-Benz E-Class Operator's Manual page 183

residues crystallize after time and
contaminate the affected surfaces.
! DEF is not a fuel additive and must not be
added to the fuel tank. If DEF is added to
the fuel tank, this can lead to engine
damage.
! Only screw on the DEF refill bottle hand-
tight. It could otherwise be damaged.
The DEF filler neck is under the trunk floor.
Switch the ignition off.
X
Open the trunk.
X
Lift up the trunk floor (
X
Turn DEF cap : counter-clockwise and
X
remove it.
Turn DEF filler cap ; counter-clockwise
X
and open it.
Filler cap ; is secured with a plastic strip.
page 312).
Y
Unscrew the protective cap from DEF refill
X
bottle =.
Position DEF refill bottle = as shown on
X
the filler neck and screw it on hand-tight.
Press DEF refill bottle = downwards.
X
The DEF tank is filled. This may take up to
one minute.
i
To top up between service intervals, fill
the DEF tank with approximately 1 gal
(3.8 l) DEF. 1 gal (3.8 l) DEF is equivalent to
approximately 2 DEF refill bottles. Then
have the DEF supply checked at a qualified
specialist workshop and completely refilled
if necessary.
Release DEF refill bottle =.
X
When DEF refill bottle = is no longer
pressed down, filling stops. DEF refill bottle
= can be removed when it has been only
partially emptied.
Turn DEF refill bottle = counter-clockwise
X
and remove it.
Mount DEF filler cap ; on the filler neck
X
and turn it clockwise.
Refueling
181
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