Seat alhambra Owner's Manual page 164

160 Refuelling
Driving in winter
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 which is more resistant to cold is sold
during the winter in some countries, and this works correctly down
to between –15 °C and –22 °C approximately, depending on the
brand of fuel used.
The biodiesel available in countries with different climactic
conditions usually has different temperature characteristics.
Technical Service Centres or service stations in each country can
inform you of the specific characteristics of the respective diesel.
Filter preheating
The vehicle is fitted with a filter preheater. This will ensure that the
fuel system will remain operational down to about –25 °C,
provided that winter Diesel which is cold resistant down to –15 °C
is used.
If, at temperatures below –25 °C the fuel is waxed to such an
extent that the engine will not start it is sufficient to place the
vehicle in a warm enclosure for a while.
Fuel a a d d d d i i t t i i v v e e s s (anti-waxing agent), petrol and similar fluids must
n n o o t t be mixed with Diesel fuel.
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