Non-Recommendation Of The Use Of Gasoline Containing Mmt; If Your Engine Knocks - Toyota 2016 Highlander Service Manual

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9-1. Specifications
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Non-recommendation of the use of gasoline containing MMT

Some gasoline contains an octane enhancing additive called MMT (Methylcy-
clopentadienyl Manganese Tricarbonyl).
Toyota does not recommend the use of gasoline that contains MMT. If fuel
containing MMT is used, your emission control system may be adversely
affected.
The malfunction indicator lamp on the instrument cluster may come on. If this
happens, contact your Toyota dealer for service.
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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 can cause damage to your vehicle's three-way catalytic
converters causing the emission control system to malfunction.
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Do not use gasohol other than the type previously stated.
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 (poor hot starting, vaporization, engine knocking, etc.) is
encountered after using a different type of fuel, 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.
HIGHLANDER_U (OM48F09U)