Isuzu 4BG1 Instruction Manual page 25

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Your engine is designed to use either Number I-D or Number 2-D
diesel fuel. However, for better fuel economy, use Number 2-D diesel
fuel whenever possible. At temperatures less than -7"C, (2O"F),
Number 2-D fuel may pose operating problems (see "Cold Weather
Operation" which follows). At colder temperatures, use Number I-D
fuel (if available) or use a "winterized" Number 2-D (a blend of
Number I-D and Number 2-D). This blended fuel is usually called
Number 2-D also, but can be used in colder temperatures than
Number 2-D fuel which has not been "winterized." Check with the
service station operator to be sure you get the properly blended fuel.
Note that diesel fuel may foam during a fill-up. This can cause the
automatic pump nozzle to shut off even though your tank is not fulls.
NOTICE: Do not use home heating oil or gasoline in your diesel
engine; either may cause engine damage.
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