Toyota HILUX Owner's Manual page 479

478
8-1. Specifications
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Fuel tank opening for unleaded gasoline
To help prevent incorrect fueling, your vehicle has a fuel tank opening that
only accommodates the special nozzle on unleaded fuel pumps.
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If your engine knocks
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Consult your Toyota dealer.
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You may occasionally notice light knocking for a short time while accelerat-
ing or driving uphill. This is normal and there is no need for concern.
NOTICE
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Notice on fuel quality
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Do not use improper fuels. If improper fuels are used, the engine will be
damaged.
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Do not use leaded gasoline.
Leaded gasoline will cause the three-way catalytic converter to lose its
effectiveness and the emission control system to function improperly.
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Notice on diesel fuel quality
FAME (Fatty Acid Methyl Ester) fuel sold under names such as "B30" or
"B100" and fuel containing a large amount of FAME should not be used.
Your vehicle can use diesel mixed with 5% max biodiesel FAME (B5).
The use of fuel with more than 5% FAME content (B5) will damage the vehi-
cle's fuel system. You must ensure that refueling is carried out only from a
source where fuel specification and quality can be guaranteed. In case of
any doubt, ask your Toyota dealer.