2004 Lexus GX470 Audio /

INTRODUCTION
550

SECTION 6 ± 2
551
SERVICE PROCEDURES AND
SPECIFICATIONS
Engine
Specifications552
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Fuel 556
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Fuel pump shut off system 559
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Facts about engine oil consumption 559
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Used engine oil 560
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Checking the engine oil level 561
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Checking the engine coolant level 566
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Checking the radiator and condenser 568
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Spark plugs 569
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ENGINE
552
SPECIFICATIONS
Ð GENERALModel
2UZ-FE
Type8 cylinder V Type, 4 cycle, gasoline
Bore and stroke94.0
84.0 mm (3.70
3.31 in.)
Displacement4664 cm3 (284.6 cu. in.)
Valve clearance (engine cold)
Intake
Exhaust0.15 Ð 0.25 mm (0.006 Ð 0.010 in.)
0.25 Ð 0.35 mm (0.010 Ð 0.014 in.)
Drive belt tensionAutomatic adjustment

62Z002
Outside temperature
ENGINE
553
Ð LUBRICATION SYSTEM
Oil capacity Drain and refillwith filter
without filter
6.2 L (6.5 qt., 5.5 lmp. qt.)
5.7 L (6.0 qt., 5.0 lmp. qt.)
Oil gradeAPI grade SL Energy-Conservingº or ILSAC multigrade engine oil
Recommended oil viscosity (SAE):
NOTE:
Toyota Genuine Motor Oilº is used in your Lexus vehicle. Use Lexus ap\
proved Toyota Genuine Motor Oilº or equivalent to satis fy
the above grade and viscosity. Please contact your Lexus dealer for further details.

ENGINE
554Ð COOLING SYSTEM
Capacity
12.9 L (13.6 qt., 11.4 lmp. qt.)
Coolant typeToyota Super Long Life Coolantº or similar high quality
ethylene glycol based non-silicate, non-amine, non-nitrite,
and non-borate coolant with long-life hybrid organic acid
technology (Coolant with long-life hybrid organic acid
technology is a combination of low phosphates and organic
acids.)
Do not use plain water alone.
NOTE:
Toyota Super Long Life Coolantº is used in your Lexus vehicle at facto\
ry fill. In order to avoid technical problems, only use Toyota
Super Long Life Coolantº or similar high quality ethylene glycol base\
d non-silicate, non-amine, non-nitrite, and non-borate coo lant
with long-life hybrid organic acid technology. (Coolant with long-life hybrid organic acid technology is a combination of low
phosphates and organic acids.) Please contact your Lexus dealer for fu\
rther details.
Ð FUEL
Fuel type
Only UNLEADED
Octane rating87 (Research octane number 91) or higher

ENGINE
555
Ð IGNITION SYSTEM
Spark plug Ð Make DENSO
NGK
Ð Gap
SK20R11
IFR6A11
1.1 mm (0.043 in.)
Ð ELECTRICAL SYSTEM
Battery Open voltage at 20 C (68F):
Charging rates
12.6 Ð 12.8 V Fully charged
12.2 Ð 12.4 V Half charged
11.8 Ð 12.0 V Discharged
[Voltage that is checked 20 minutes after the key is removed
with all the lights turned off]
5 A max.

ENGINE
556
FUEL
Fuel type
Your vehicle must use only unleaded gasoline.
To help prevent gas station mixups, your Lexus has a smaller
fuel tank opening. The special nozzle on pumps with unleaded
fuel will fit it, but the larger standard nozzle on pumps with
leaded gas will not. At a minimum, the gasoline you use should meet the
specifications of ASTM D4814 in the U.S.A. and CGSB
3.5-M93 in Canada.
NOTICE
Do not use leaded gasoline. Use of leaded gasoline will
cause the three-way catalytic converter to lose itseffectiveness and the emission control system tofunction improperly. Also, this can increasemaintenance costs.
Octane rating
Select Octane Rating 87 (Research Octane Number 91) or
higher. For improved vehicle performance, the use of
premium unleaded gasoline with an Octane Rating of 91
(Research Octane Number 96) or higher is recommended. Use of unleaded fuel with an octane number or rating lower
than stated above will cause persistent heavy knocking. If
severe, this will lead to engine damage.
If your engine knocks...
If you detect heavy knocking even when using the
recommended fuel, or if you hear steady knocking while
holding a steady speed on level roads, consult your Lexus
dealer.
However, occasionally, you may notice light knocking for a
short time while accelerating or driving up hills. This is normal
and there is no need for concern.
Gasoline containing detergent additives

ENGINE
557
Lexus recommends the use of gasoline that contains
detergent additives to avoid build-up of engine deposits.
However, all gasoline sold in the U.S. contains detergent
additives to keep clean and/or clean intake systems.
Quality gasoline
Automotive manufacturers in the U.S., Europe and Japan
have developed a specification for quality fuel named
World-W ide Fuel Charter (WWFC) that is expected to be
applied world wide. The WWFC consists of four
categories that depend on required emission levels. In the
U.S., category 3 has been adopted. The WWFC improves
air quality by providing for better emissions in vehicle
fleets, and customer satisfaction through better vehicle
performance.
Cleaner burning gasoline
Cleaner burning gasoline, including reformulated
gasoline that contains oxygenates such as ethanol or
MTBE is available in many areas.
Lexus recommends the use of cleaner burning gasoline and
appropriately blended reformulated gasoline. These types of
gasoline provide excellent vehicle performance, reduce
vehicle emissions, and improve air quality.
Oxygenates in gasoline
Lexus 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 Lexus, be sure that it has
an octane rating no lower than 87.
Lexus does not recommend the use of gasoline containing
methanol.
Gasoline containing MMT
Some gasoline contain an octane enhancing additive
called MMT (Methylcyclopentadienyl Manganese
Tricarbonyl).
Lexus 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 Lexus dealer for service.