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O P E R A T I N G
I N S T R U C T I O
Fuel additives
On carburetor engines with and without
catalysts carburetor icing can occur at
ambient temperatures between 0° C and
+ 15° C when the air humidity is high
despite the automatically controlled in-
take air preheating. This can cause the
engines to stall occasionally when idling
in the warm-up phase.
Even the anti-icing additives contained
in some fuels in the cold season cannot
entirely prevent carburetor icing. When a
properly tuned engine stalls repeatedly
in the conditions described above it is
advisable to mix Volkswagen AUDI petrol
additive with the fuel. This additive pre-
vents carburetor icing and also cleans
the carburetor and protects it against
corrosion. It is obtainable from V.A.G
workshops in Germany and in many
export countries.
No other fuel additives should be mixed
with the petrol.
Diesel engines
Diesel fuel to DIN 51601
C N
n
not lower than 45
When using summer Diesel trouble may
be experienced at temperatures below
0° C because the fuel thickens due to
wax separation.
For this reason, winter Diesel whcih is
more resistant to cold is sold during
the winter and works satisfactorily down
to about -15° C.
In countries with different climatic con-
ditions the Diesel fuels offered have a
different temperature behaviour. Check
with V.A.G dealers or filling stations in
the country concerned regarding the
availability of Diesel fuels.
When necessary summer and winter
Diesel can be used at lower tempera-
tures by mixing regular leaded or lead-
free petrol (not premium) with the Diesel.
As this additive reduces the engine out-
put, only the amount actually required
should be used: (max. 30%)
Tempe-
rature
in ° C
Sum-
mer
Diesel
Petrol
Winter-
Diesel
Petrol
- 0 to
- 5
85%
15%
100%
-
- 5 to
- 1 5
70%
30%
100%
-
- 1 5 to
-25
-
-
70%
30%
This table is based on the fuels available
in Germany.
Due to the inflammability of petrol the
mixing should, for safety reasons, only
be done in the vehicle tank. Where pos-
sible, the petrol should be put into the
tank before the Diesel.
64
" Cetane Number, indicates the ignitability of
Diesel.
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