Toyota 2014 Sienna Manual page 813

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 can cause damage to your vehicle's catalytic converters
causing the emission control system to malfunction.
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Do not use gasohol other than that stated here.
Other gasohol may cause fuel system damage or vehicle performance
problems.
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Using unleaded gasoline with an octane number or rating lower than the
level previously stated will cause persistent heavy knocking.
At worst, this will lead to engine damage.
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Fuel-related poor driveability
If poor driveability is encountered after using a different type of fuel (poor hot
starting, vaporization, engine knocking, etc.), discontinue the use of that type
of fuel.
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When refueling with gasohol
Take care not to spill gasohol. It can damage your vehicle's paint.
SIENNA_OM_OM45483U_(U)
6-1. Specifications
6
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