TOYOTA 2010 Sienna User Manual
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6-1. Specifications
NOTICE
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Notice on gasoline quality
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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 that
stated here will cause persistent heavy knocking.
At worst, this will lead to engine damage.
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Fuel-related poor driveability
If after using a different type of fuel, poor driveability is encountered (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.