OPM 250 en-GB 87
© Scania CV AB 2022, Sweden
Reductant with SCR
Reductant with SCR
The operator is responsible for using the correct
type of reductant to ensure that local laws are
complied with.
Reductant is a solution consisting of urea and
water and is usually called AdBlue®, DEF,
ARLA 32 or AUS 32/AUS 40 depending on the
market. If the engine is fitted with an SCR sys-
tem, the reductant is added to the exhaust gases
upstream of the catalytic converter. This reduces
nitrogen oxide emissions. The SCR system can
be used with either 32.5% or 40% by weight of
urea.
Reductant with 32.5% by weight of urea freezes
at approx. -11°C (12°F). With 40% by weight of
urea freezes at 0°C (32°F). When the solution
freezes, ice and urea always maintain the same
concentration. Always store the reductant at a
temperature of between 0°C and 30°C (32 to
86°F).
Reductant is normally colourless if no dye has
been added. It is not harmful to the skin. Nor is it
toxic in small quantities, but it tastes very un-
pleasant.
Reductant is highly corrosive. Therefore, rinse
any reductant spillage from connections and oth-
er details using lukewarm water. Water works
very well for cleaning purposes. Please use hot
water. If reductant seeps into electrical connec-
tions or electrical cables, these must be renewed.
Reductant has a low surface tension and rapidly
spreads over large areas, which then become
very slippery.
Reductant can dry out and form white or greyish
brown crystals or deposits that can be washed
away with warm water.
The use of reductant that has aged can damage
important components in the SCR system. The
ageing process is accelerated by a high ambient
temperature.
The reductant should be handled in accordance
with the following shelf life recommendation.
The risk of crystal formation increases with low
outdoor temperatures. When the outdoor temper-
ature is below -20°C (-4°F), reductant dosing is
switched off to avoid the risk of crystals forming
in the SCR system.
Constant ambient
storage temperature in
°C.
Minimum shelf life in
months according to
ISO 22241-3
≤10 36
≤25 18
≤30 12
≤35 6
>35 Significant loss of ser-
vice life: check each kit
before use
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