’01 4Runner_U (L/O 0008)
OCTANE RATING
QUALITY GASOLINE
Automotive manufacturers in the U.S.,
Europe and Japan have developed
OXYGENATES IN GASOLINE
Select Octane Rating 87 (Research Oc-
tane Number 91) or higher.
Toyota allows the use of oxygenate
blended gasoline where the oxygenate
content is up to 10% ethanol or 15%
MTBE. If you use gasohol in your
Toyota, be sure that it has an octane
rating no lower than 87.
a
specification for quality fuel named
World−Wide Fuel Charter (WWFC) that
is expected to be applied world wide.
The WWFC consists of three categories
that depend on required emission lev-
els. In the U.S., category 3 has been
adopted. The WWFC improves air quali-
ty by providing for better emissions in
vehicle fleets, and customer satisfaction
through better vehicle performance.
Use of unleaded gasoline with an octane
rating or research octane number lower
than stated above will cause persistent
heavy knocking. If it is severe, this will
lead to engine damage.
Toyota does not recommend the use of
gasoline containing methanol.
If your engine knocks...
SULFUR IN GASOLINE
If you detect heavy knocking even when
using the recommended fuel, or if you
hear steady knocking while holding
steady speed on level roads, consult your
Toyota dealer.
If your vehicle is certified to California
Emission Regulations, the vehicle is de-
signed to operate on California cleaner
burning gasoline (CBG) that contains
lower sulfur. If you cannot use Califor-
nia CBG, your emission control system
may suffer damage and turn on the
Malfunction Indicator Lamp.
a
CLEANER BURNING GASOLINE
Cleaner burning gasoline, including re-
formulated gasoline that contains oxy-
genates such as ethanol or MTBE is
available in many areas.
However, now and then, you may notice
light knocking for a short time while accel-
erating or driving up hills. This is no need
of concern.
Toyota recommends the use of cleaner
burning gasoline and appropriately blended
reformulated gasoline. These types of gas-
oline provide excellent vehicle perfor-
mance, reduce vehicle emissions, and im-
prove air quality.
If the malfunction is caused by the type
of fuel used, repairs may not be covered
by your warranty.
GASOLINE CONTAINING DETERGENT
ADDITIVES
Toyota recommends the use of gasoline
that contains detergent additives to
avoid build−up of engine deposits.
GASOLINE CONTAINING MMT
Some gasoline contain an octane en-
hancing additive called MMT (Methylcy-
clopentadienyl Manganese Tricarbonyl).
However, all gasoline sold in the U.S.
contains detergent additives to keep clean
and/or clean intake systems.
2001 4RUNNER (OM35768U)
192
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