2008 Lexus GX470 engine

5
When trouble arises
409
5-2. Steps to take in an emergency
■Overheating
In the following situations, your vehicle may be overheating.
●The engine coolant temperature gauge enters the red zone or a loss of power is
experienced.
●Steam is coming from under the hood.
CAUTION
■To prevent an accident or injury when inspecting under the hood of your vehicle
●Keep hands and clothing away from the fan and engine drive belt while the
engine is running.
●Do not loosen the radiator cap while the engine and radiator are hot.
Serious injury, such as burns, may result from hot coolant and steam released
under pressure.
NOTICE
■When adding coolant
Wait until the engine has cooled down before adding coolant.
When adding coolant, do so slowly. Adding cold coolant to a hot engine too quickly
can cause damage to the engine.
Add coolant if required.
Water can be used as an emer-
gency measure if coolant is
unavailable. (→P. 4 1 6 )
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP5

410
5-2. Steps to take in an emergency
If the vehicle becomes stuck
CAUTION
■When attempting to free a stuck vehicle
If you choose to rock the vehicle back and forth to free it, make sure the surround-
ing area is clear, to avoid striking other vehicles, objects or persons. The vehicle
may also lunge forward or lunge back suddenly as it becomes free. Use extreme
caution.
■When shifting the shift lever
Be careful not to shift the shift lever with the accelerator pedal depressed.
This may lead to unexpected rapid acceleration of the vehicle that may cause an
accident and result in death or serious injury.
NOTICE
■To avoid damaging the transmission and other components
●Avoid spinning the wheels and racing the engine.
●If the vehicle remains stuck after trying these procedures, the vehicle may require
towing to be freed.
Carry out the following procedures if the tires spin or the vehicle becomes
stuck in mud, dirt, or snow.
Stop the engine. Set the parking brake and shift the shift lever
to “P”.
Remove the mud, snow, or sand from around the stuck tire.
Place wood, large stones or some other material to help pro-
vide traction under the tires.
Restart the engine.
Lock the center differential to turn off the vehicle stability con-
trol system. (→ P. 147)
Release the parking brake and shift the shift lever to the “D” or
“R” position and carefully apply the accelerator to free the
vehicle.STEP1
STEP2
STEP3
STEP4
STEP5
STEP6

413
6-1. Specifications
6
Vehicle specifications
Vehicle identificationThe vehicle identification number (V IN) is the legal identifier for your
vehicle. This is the primary identification number for your Lexus. It is used
in registering the ownership of your vehicle.
This number is stamped on the top
left of the instrument panel.
This number is also on the Certifi-
cation Label.
■ Engine number
The engine number is stamped on
the engine block as shown.

414
6-1. Specifications
Engine
Fuel
Model2UZ-FE
Ty p e8-cylinder V type, 4-cycle, gasoline
Bore and stroke3.70 × 3.31 in. (94.0 × 84.0 mm)
Displacement284.5 cu.in. (4664 cm3)
Drive belt tensionAutomatic adjustment
Fuel typePremium unleaded gasoline only
Octane rating91 (Research Octane Number 96) or higher
Fuel tank capacity23 gal. (87 L, 19.1 Imp.gal)

415
6-1. Specifications
6
Vehicle specifications
Lubrication system
*: 5W-30 is an oil that provides optimal levels of fuel efficiency.
Oil viscosity:
● The 5W portion of the oil viscosity rating indicates the characteristic of
the oil which allows cold startability. Oils with a lower value before the W
allow for easier starting of the engine in cold weather.
● The 30 in 5W-30 indicates the oil viscosity when the oil is as its operating
temperature. An oil with a higher viscosity may be better suited if the
vehicle is operated at high speeds, or under extreme load conditions.
Oil capacity
drain and refill
(reference)
with filter
without filter6.5 qt. (6.2 L, 5.5 Imp.qt.)
6.0 qt. (5.7 L, 5.0 Imp.qt.)
Oil gradeILSAC multigrade engine oil
Recommended oil
viscosity
Use Lexus approved “Toyota Genuine Motor Oil” or
equivalent to satisfy the grade and viscosity shown
below.
Outside temperature

416
6-1. Specifications
Cooling system
Ignition system
Capacity13.6 qt. (12.9 L, 11.4 Imp.qt.)
Coolant type
Use either of the following:
• “Toyota Super Long Life Coolant”
• Similar high-quality ethylene glycol-based non-sili-cate, non-amine, non-nitrite, and non-borate cool-
ant with long-life hybrid organic acid technology
Do not use plain water alone.
Spark plug
Make DENSO
NGKSK20R11
IFR6A11
Gap0.043 in. (1.1 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the gap when tuning the engine.

418
6-1. Specifications
Tr a n s f e r
Automatic transmission
Brakes
*1: Minimum pedal clearance when depressed with a force of 490 N (50 kgf, 110
lbf) while the engine is running.
*2: Parking brake adjustment when depressed with a force of 196 N (20 kgf, 44lbf).
Oil capacity1.5 qt. (1.4 L, 1.2 Imp.qt.)
Oil typeHypoid gear oil API GL-5
Recommended oil viscositySAE 75W-90
Fluid capacity
Drain and refill
3.2 qt. (3.0 L, 2.6 lmp.qt.)
Fluid typeTo y o t a G e n u i n e AT F W S
NOTICE
■Automatic transmission fluid type
Using transmission fluid other than “Toyota Genuine ATF WS” may cause deterio-
ration in shift quality, locking up of your transmission accompanied by vibration, and
ultimately damage the transmission of your vehicle.
Pe d a l c l e a r a n c e *12.0 in. (52 mm) Min.
Pedal free play0.04  0.24 in. (1.0  6.0 mm)
Brake pad wear limit0.04 in. (1.0 mm)
Parking brake adjustment *25  7 clicks
Parking brake lining wear limit0.04 in. (1.0 mm)
Fluid typeSAE J1703 or FMVSS No. 116 DOT 3

421
6-1. Specifications
6
Vehicle specifications
Fuel information
■Fuel tank opening for unleaded gasoline
To help prevent incorrect fueling, your Lexus has a fuel tank opening that only
accommodates the special nozzle on unleaded fuel pumps.
■If premium gasoline is not available
If this premium fuel is not available, you may use unleaded gasoline with an octane
rating as low as 87 (Research Octane Number 91).
■If your engine knocks
●Consult your Lexus dealer.
●You may occasionally notice light knocking for a short time while accelerating
or driving uphill. This is normal and there is no need for concern.
■Gasoline quality
In very few cases, driveability problems may be caused by the brand of gasoline you
are using. If driveability problems persist, try changing the brand of gasoline. If this
does not correct the problem, consult your Lexus dealer.
Your vehicle must use only unleaded gasoline.
Premium unleaded gasoline with an Octane Rating of 91 (Research
Octane Number 96) or higher required for optimum engine performance.
At minimum, the gasoline you use should meet the specifications of
ASTM D4814 in the U.S.A. and CGSB3.5-M93 in Canada.