2003 Lexus GS300 Engine

SECTION 6 ± 2
SERVICE PROCEDURES AND
SPECIFICATIONS
Engine
Specifications (GS430) 250. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications (GS300) 253. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel256 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel pump shut off system258 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Facts about engine oil consumption258 . . . . . . . . . . . . . . . . . . . . . . . .
Used engine oil260 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the engine oil level260 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the engine coolant level264 . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the radiator and condenser266 . . . . . . . . . . . . . . . . . . . . . . .
Spark plugs267 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SPECIFICATIONS (GS430)
± GENERAL
Model
3UZ±FE
Type8 cylinder V type, 4 cycle, gasoline
Bore and stroke91.0 X 82.5 mm (3.58 X 3.25 in.)
Displacement4293 cm3 (261.9 cu.in.)
Valve clearance (engine cold)
Intake
Exhaust0.15 ± 0.25 mm (0.006 ± 0.010 in.)
0.25 ± 0.35 mm (0.010 ± 0.014 in.)
Drive belt tensionAutomatic adjustment
± FUEL
Fuel type
Only UNLEADED
Octane rating91 (Research octane number 96) or higher

62sa08
Temperature range anticipated before next oil change
± LUBRICATION SYSTEM
Oil capacity
Drain and refill
with filter
without filter
5.2 L (5.5 qt., 4.6 lmp.qt.)
4.9 L (5.2 qt., 4.3 lmp.qt.)
Oil gradeAPI grade SL ªEnergy±Conservingº or ILSAC multigrade engine oil
Recommended oil viscosity5W±30
NOTE:
ªToyota Genuine Motor Oilº is filled in your Lexus vehicle. Use Lexus approved ªToyota Genuine Motor Oilº or equivalent to satisfy
the above grade and viscosity. Please contact your Lexus dealer for further details.

± COOLING SYSTEM
Capacity
9.0 L (9.5 qt., 7.9 lmp.qt.)
Coolant typeªToyota Genuine Long Life Coolantº or equivalent
With ethylene±glycol type coolant for a proper corrosion protection of
aluminum components
Do not use alcohol type antifreeze or plain water alone.
NOTE:
ªToyota Genuine Long Life Coolantº is filled in your Lexus vehicle. In order to avoid technical problems, we strongly recommend
using ªToyota Genuine Long Life Coolantº or equivalent. Please contact your Lexus dealer for further details.
± IGNITION SYSTEM
Spark plug ± Make DENSO
NGK
± Gap
SK20R11
IFR6A11
1.1 mm (0.043 in.)
± ELECTRICAL SYSTEM
Battery ± Open voltage at 20C (68F):
± Charging rates
12.7V Fully charged
12.3V Half charged
11.9V Discharged
[Voltage that is checked 20 minutes after the key is removed with all the
lights turned off]
5A max.

SPECIFICATIONS (GS300)
± GENERAL
Model
2JZ±GE
Type6 cylinder in line, 4 cycle, gasoline
Bore and stroke86.0 X 86.0 mm (3.39 X 3.39 in.)
Displacement2997 cm3 (182.9 cu.in.)
Valve clearance (engine cold)
Intake
Exhaust0.15 ± 0.25 mm (0.006 ± 0.010 in.)
0.25 ± 0.35 mm (0.010 ± 0.014 in.)
Drive belt tensionAutomatic adjustment
± FUEL
Fuel type
Only UNLEADED
Octane rating91 (Research octane number 96) or higher

62sa08
Temperature range anticipated before next oil change
± LUBRICATION SYSTEM
Oil capacity
Drain and refill
with filter
without filter
5.4 L (5.7 qt., 4.8 lmp.qt.)
5.1 L (5.4 qt., 4.5 lmp.qt.)
Oil gradeAPI grade SL ªEnergy±Conservingº or ILSAC multigrade engine oil
Recommended oil viscosity5W±30
NOTE:
ªToyota Genuine Motor Oilº is filled in your Lexus vehicle. Use Lexus approved ªToyota Genuine Motor Oilº or equivalent to satisfy
the above grade and viscosity. Please contact your Lexus dealer for further details.

± COOLING SYSTEM
Capacity
7.7 L (8.1 qt., 6.8 lmp.qt.)
Coolant typeªToyota Genuine Long Life Coolantº or equivalent
With ethylene±glycol type coolant for a proper corrosion protection of
aluminum components
Do not use alcohol type antifreeze or plain water alone.
NOTE:
ªToyota Genuine Long Life Coolantº is filled in your Lexus vehicle. In order to avoid technical problems, we strongly recommend
using ªToyota Genuine Long Life Coolantº or equivalent. Please contact your Lexus dealer for further details.
± IGNITION SYSTEM
Spark plug ± Make DENSO
± Gap
SK16R±P11
1.1 mm (0.043 in.)
± ELECTRICAL SYSTEM
Battery ± Open voltage at 20C (68F):
± Charging rates
12.7V Fully charged
12.3V Half charged
11.9V Discharged
[Voltage that is checked 20 minutes after the key is removed with all the
lights turned off]
5A max.

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 its
effectiveness and the emission control system to
function improperly. Also, this can increase
maintenance costs.
Octane rating
Select premium unleaded gasoline with an Octane Rating
of 91 (Research Octane Number 96) or higher for optimum
engine performance. However, if such premium type
cannot be obtained, you may temporarily use unleaded
gasoline with an Octane Rating as low as 87 (Research
Octane Number 91).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
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±Wide Fuel Charter (WWFC) that is expected to be
applied world wide. The WWFC consists of three
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.