Volvo S80 Owner's Manual page 148

Only use diesel fuel from a well-known oil company that fulfils the
requirements for recommended fuel grade as described on page 164.
Never use diesel of doubtful quality. Special diesel fuel for winter use is
available from large oil companies. This fuel is less viscous at low
temperatures and reduces the risk of wax building up in the fuel system.
Keeping the tank well filled reduces the risk of condensation in the tank.
During filling you should check that the area around the filler pipe is
clean. If you do the refuelling from a tank of your own, you should
filter the fuel.
Avoid spilling onto the paintwork. Wash off any spills with detergent
and water.
No special procedures are required if the tank runs dry. The fuel system
is bled automatically if the ignition switch is kept in position II for
approx. 60 seconds before the start attempt.
Diesel type fuels which must not be used:
special additives, Marine Diesel Fuel, fuel
oil, RME (Rape Methyl Ester), vegetable
oil.
These fuels do not fulfil the requirements
of Volvo's recommendation and generate
increased wear and engine damage that is
not covered by the Volvo warranty.
The fuel filter removes condensation, which could otherwise affect engine
function, from the fuel. The fuel filter should be drained as specified in the
Service and Warranty Book, and when you suspect that the car has been
filled with contaminated fuel.
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