Lexus 2016 GS350 Owner's Manual page 557

NOTICE
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.
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Leaded gasoline can cause damage to your vehicle' s three-way catalytic converters
causing the emission control system to malfunction.
Do not use gasohol other than the type previously stated.
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Other gasohol may cause fuel system damage or vehicle performance problems.
Using unleaded gasoline with an octane number or rating lower than the level previ-
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ously stated will cause persistent heavy knocking.
At worst, this will lead to engine damage.
Fuel-related poor driveability
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If poor driveability (poor hot starting, vaporization, engine knocking, etc.) is encoun-
tered after using a different type of fuel, discontinue the use of that type of fuel.
When refueling with gasohol
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Take care not to spill gasohol. It can damage your vehicle' s paint.
GS350_200t_GS F_OM_OM30E86U_(U)
557
8-1. Specifications
8