PEUGEOT 308 Handbook page 280

Checks
 Obtain a bottle of AdBlue
checking the use-by date, read carefully
the instructions on use on the label before
pouring the contents of the bottle into your
vehicle's AdBlue tank. tank.
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Important: if your vehicle's AdBlue
tank is completely empty - which is
confirmed by the alert messages and
the impossibility of starting the engine -
you must add at least 3.8 litres, so two
1.89 litre bottles.
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 After emptying the bottle, wipe away any
spillage around the tank filler using a damp
cloth.
If any additive is split or splashed, wash
. After first
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immediately with cold water or wipe with
a damp cloth.
If the additive has crystallised, clean it
off using a sponge and hot water.
 Refit the blue cap to the tank and turn it
a 6 of a turn clockwise, to its stop.
th
 Refit the black cap and turn it a quarter of
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a turn clockwise without pressing. Ensure
that the indicator on the cap lines up with
the indicator on the support.
 Lower the boot floor and close the tailgate.
Important: when topping-up after
running out of additive , signalled
by the message "Top up emissions
additive: Starting prevented", you
must wait for about 5 minutes before
switching on the ignition, without
opening the driver's door, unlocking
the vehicle, introducing the key
into the ignition switch, or placing
the key of the "Keyless Entry and
Starting" system inside the vehicle.
Switch on the ignition, then wait for
10 seconds before starting the engine.
Never dispose of AdBlue additive additive
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bottles in the household waste. Place
them in a special container provided
this purpose or take them to your dealer.