2003 Lexus GX470 Basic Functions / LEXUS 2003 GX470 OWNER'S MANUAL (OM60979U)

ENGINE
420
If the oil level is below or only slightly above the low line,
add engine oil of the same type as already in the engine.
Remove the oil filler cap and add engine oil a little at a time,
checking the dipstick. We recommend that you use a funnel
when adding oil. The approximate quantity of oil needed to fill
between the low line and the full line on the dipstick is indicated
below for reference.
When the level reaches within the correct range, return the filler
cap and turn the cap clockwise until you hear a click.
Oil quantity. L (qt., lmp. qt.) 1.5 (1.6, 1.3)
NOTICE
 Be careful not to spill the engine oil on the vehicle
components.
 Avoid overfilling, or the engine could be damaged.
 Check the oil level on the dipstick once again after
adding the oil.
Engine oil selection
“Toyota Genuine Motor Oil” is filled in your Lexus vehicle. Use
Lexus approved “Toyota Genuine Motor Oil” or equivalent to
satisfy the following grade and viscosity.
Oil grade: API grade SL “Energy −Conserving” or ILSAC
multigrade engine oil.
Recommended viscosity: SAE 5W −30
62Z002
Outside temperature
SAE 5W30 is the best choice, for good fuel economy and
good starting in cold weather.
If SAE 5W30 oil is not available, SAE 10W30 may be
used. However, it should be replaced with SAE 5W30 at
the next oil change.

ENGINE
421
Oil identification marks
 API Service Symbol  ILSAC Certification Mark
Either or both API registered marks are added to some oil
containers to help you select the oil you should use.
 The API Service Symbol is located anywhere on the outside
of the container.
The top portion of the label shows the oil quality by API
(American Petroleum Institute) designation such as SL.
The center portion of the label shows the SAE viscosity
grade such as SAE 5W −30. “Energy− Conserving”, shown
in the lower portion, indicates that the oil has fuel −saving
capabilities.
 The ILSAC (International Lubricant Standardization and
Approval Committee) Certification Mark is displayed on the
front of the container. To ensure excellent lubrication performance for your engine,
the “Toyota Genuine Motor Oil” range is available, which has
been specifically tested and approved for all Lexus engines.
Please contact your Lexus dealer for further details of the
“Toyota Genuine Motor Oil” range.

ENGINE
422
CHECKING THE ENGINE COOLANTLEVEL
 1 Reservoir cap 2 “F” (upper) line 3 “L” (lower) line
Look at the seethrough coolant reservoir when the
engine is cold. The coolant level is satisfactory if it is
between the“F” and “L” lines on the reservoir. If the level
is low, add ethyleneglycol type coolant for a proper
corrosion protection of aluminum components.
The coolant level in the reservoir will vary with engine
temperature. However, if the level is on or below the “L” line,
add coolant. Bring the level up to the “F” line.
Always use ethylene −glycol type coolant for a proper corrosion
protection of aluminum components. See information in the
next column. If the coolant level drops within a short time after replenishing,
there
may be a leak in the system. Visually check the radiator,
hoses, engine coolant filler cap, radiator cap and drain cock
and water pump.
If you can find no leak, have your Lexus dealer test the radiator
cap pressure and check for leaks in the cooling system.
CAUTION
To prevent burning yourself, do not remove the radiator
cap when the engine is hot.
Coolant type selection
Use of improper coolants may damage your engine cooling
system. Your coolant must contain ethylene −glycol type
coolant for a proper corrosion protection of your engine that
contains aluminum components. We have used “Toyota
Genuine Lo ng Life Coolant” in your Lexus vehicle. In order to
avoid technical problems, we strongly recommend using
“Toyota Genuine Long Life Coolant” or equivalent.
In addition to preventing freezing and subsequent damage to
the engine, this type of coolant will also prevent corrosion.
Further supplemental inhibitors or additives are neither
needed nor recommended.
Read the coolant container for information on freeze
protection. Follow the manufacturer’s directions for how much
to mix with plain water (preferably demineralized water or
distilled water). The total capacity of the cooling system is
given on page 413.

ENGINE
423
We recommend to use 50% solution for your Lexus, to provide
protection
down to about −35C (− 31F). When it is extremely
cold, to provide protection down to about −50C (−58F), 60%
solution is recommended. Do not use more than 70% solution
for better coolant performance.
NOTICE
Do not use alcohol type antifreeze or plain water alone.
The engine cooling system is integral to maximizing
performance of your Lexus vehicle. In line with this, it is
strongly recommended that you use “Toyota Genuine Long
Life Coolant” for protecting the system, as it is an
ethylene −glycol based premium antifreeze coolant with
excellent corrosion protection properties that has been
specifically formulated for use in Lexus vehicles.
Please contact your Lexus dealer for further details of the
“Toyota Genuine Long Life Coolant” range.
CHECKING THE RADIATOR AND CONDENSER
If either of the above parts are extremely dirty or you are not
sure of their condition, take your vehicle to Lexus dealer.
CAUTION
To prevent burning yourself, be careful not to touch the
radiator or condenser when the engine is hot.
NOTICE
To prevent damage to the radiator and condenser, do
not perform the work by yourself.

ENGINE
424
SPARK PLUGS
Your engine is fitted with iridiumtipped spark plugs.
NOTICE
Use only iridiumtipped spark plugs and do not adjust
gaps for your engine performance and smooth
drivability.

ENGINE
425

SECTION 6 – 3
426
SERVICE PROCEDURES AND
SPECIFICATIONS
Chassis
Specifications427
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Checking brake fluid 430
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Checking power steering fluid 431
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Checking tire pressure 432
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Rotating tires 434
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Checking and replacing tires 434
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Installing snow tires and chains 437
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Replacing wheels 439
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. . .
Aluminum wheel precautions 440
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Suspension and chassis 441
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CHASSIS
427
SPECIFICATIONS
DIFFERENTIALOil capacity Front
Rear
1.4 L (1.5 qt., 1.2 lmp.qt.)
3.1 L (3.3 qt., 2.7 lmp.qt.)
Oil typeHypoid gear oil API GL −5
Oil viscosityAbove − 18C (0F): SAE 90
Below − 18C (0F): SAE 80W or SAE 80W −90
TRANSFER
Oil capacity
1.4 L (1.5 qt., 1.2 lmp.qt.)
Oil typeHypoid gear oil API GL −5
Recommended oil viscositySAE 75W− 90