Toyota 4runner 2010 Instruction Manual page 619

Non-recommendation of the use of gasoline containing MMT
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Some gasoline contains an octane enhancing additive called MMT (Methyl-
cyclopentadienyl 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.
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 acceler-
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ating or driving uphill. This is normal and there is no need for concern.
NOTICE
Notice on fuel quality
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Do not use improper fuels. If improper fuels are used, the engine will be
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damaged.
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
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level previously started will cause persistent heavy knocking.
At worst, this will lead to engine damage.
Fuel-related poor driveability
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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.
When refueling with gasohol
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Take care not to spill gasohol. It can damage your vehicle's paint.
6-1. Specifications
625
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