2006 Lexus GS430 Scheduled Maintenance Guide / LEXUS 2006 GS430/GS300 FROM JAN. 2006 PROD. OWNER'S MANUAL (OM30786U)

INTRODUCTION
513
After checking the items, install the engine compartment
covers and insert the plastic clips in their original
positions.
1
When inserting the plastic screw, push it in.
G61005
2When inserting the clips, do as shown above.
NOTICE
After install the engine compartment cover, make sure
the cover is securely in its original position.
DOITYOURSELF SERVICE
PRECAUTIONS
If you perform maintenance yourself, be sure to follow the
correct procedure given in this Section.
You should be aware that improper or incomplete servicing
may result in operating problems.
Performing do −it−yourself maintenance during the warranty
period may affect your warranty coverage. Read the separate
Lexus Warranty statement for details and suggestions.
This Section gives instructions only for those items that are
relatively easy for an owner to perform. As explained in
Section 5, there are still a number of items that must be
performed by a qualified technician with special tools.
For information on tools and parts for do −it −yourself
maintenance, see ”Parts and tools” on page 516.
Utmost care should be taken when working on your vehicle to
prevent accidental injury. Here are a few precautions that you
should be especially careful to observe:

INTRODUCTION
514
CAUTION
When the engine is running, keep hands, clothing,
and tools away from the moving fan and engine drive
belt. (Removing rings, watches, and ties is
advisable.)
 Right after driving, the engine compartment the
engine, radiator and exhaust manifold, etc. will be
hot. So be careful not to touch them. Oil and other
fluids may also be hot.
 Do not leave anything that may burn easily, such as
paper or rags, in the engine compartment.
 Do not smoke, cause sparks or allow open flames
around fuel or the battery. Their fumes are
flammable.
 Do not get under your vehicle with just the body jack
supporting it. Always use automotive jack stands or
other solid supports.
 Be sure the engine switch is off if you work near the
electric cooling fan or radiator grille. With the engine
switch on, the electric cooling fan may automatically
start to run if the air conditioning is on and/or if the
coolant temperature is high.
 Use eye protection whenever you work on or under
your vehicle where you may be exposed to flying or
falling material, fluid spray, etc.
 Be extremely cautious when working on the battery.
It contains poisonous and corrosive sulfuric acid.
NOTICE
Remember that battery and ignition cables carry high
currents or voltages. Be careful of accidentally
causing a short circuit.
 Add only ”T oyota Super Long Life Coolant” or similar
high quality ethylene glycol based nonsilicate,
nonamine, nonnitrite, and nonborate coolant with
longlife hybrid organic acid technology to fill the
radiator. “Toyota Super Long Life Coolant” is a
mixture of 50% coolant and 50% deionized water (for
the U.S.A.) or 55% coolant and 45% deionized water
(for Canada).
 If you spill some of the coolant, be sure to wash it off
with water to prevent it from damaging the parts or
paint.
 Before closing the engine hood, check to see that you
have not forgotten any tools, rags, etc.
 Do not drive with the air cleaner removed, or
excessive engine wear could result. Also backfiring
could cause a fire in the engine compartment.
 Be careful not to scratch the glass surface with the
wiper frame.

INTRODUCTION
515
POSITIONING THE JACK
G61006
Front
G61007
Rear
When jacking up your vehicle with the jack, position the
jack correctly as shown in the illustrations.
CAUTION
When jacking, be sure to observe the following to re-
duce the possibility of personal injury:
 Follow jacking instructions.
 Do not put any part of your body under the vehicle
supported by the jack. Personal injury may occur.
 Do not start or run the engine while your vehicle is
supported by the jack.
 Stop the vehicle on a level firm ground, firmly set the
parking brake and put the transmission in “P” posi-
tion.
 Make sure to set the jack properly in the jack point.
Raising the vehicle with jack improperly positioned
will damage the vehicle or may allow the vehicle to fall
off the jack and cause personal injury.
 Never get under the vehicle when the vehicle is sup-
ported by the jack alone; use vehicle support stands.
 Do not raise the vehicle with someone in the vehicle.
 When raising the vehicle, do not place any objects on
top of or underneath the jack.
NOTICE
Make sure to place the jack correctly, or your vehicle
may be damaged.

INTRODUCTION
516
PARTS AND TOOLS
Here is a list of parts and tools you will need to perform
do−it−yourself maintenance. Remember all Lexus parts are
designed in metric sizes, so your tools must be metric.
Checking the engine oil level
Parts (if level is low):
“Toyota Genuine Motor Oil” or equivalent
Oil grade: ILSAC multigrade engine oil. For recommended
oil viscosity, see page 533.
Tools:
 Rag or paper towel
 Funnel (only for adding oil)
Checking the engine coolant level
Parts (if level is low):
”Toyota Super Long Life Coolant” or similar high quality
ethylene glycol based non −silicate, non −amine, non −nitrite,
and non −borate coolant with long −life hybrid organic acid
technology.
“Toyota Super Long Life Coolant” is a mixture of 50%
coolant and 50% deionized water (for the U.S.A.) or 55% of
coolant and 45% deionized water (for Canada).
Tools:
 Funnel (only for adding coolant)
Checking brake fluid
Parts (if level is low):
FMVSS No. 116 DOT 3 or SAE J1703 brake fluid
Tools:
 Funnel (only for adding fluid)
Checking battery condition
Tools:
Warm water
 Baking soda
 Grease
 Conventional wrench (for terminal clamp bolts)
Checking and replacing the blade type fuses
Parts (if replacement is necessary):
Fuse with same amperage rating as original
Checking the cartridge type fuses
Parts (if replacement is necessary):
Genuine Lexus fuse or equivalent with same amperage
rating as original

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517
Adding washer fluid
Parts:
Water
 Washer fluid containing antifreeze (for winter use)
Tools:
 Funnel

INTRODUCTION
518

SECTION 6 – 2
519
SERVICE PROCEDURES AND
SPECIFICATIONS
Engine
Specifications (GS430)520
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications (GS300) 523
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel 526
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . . . . . . . . . . . .
Fuel pump shut off system 528
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Facts about engine oil consumption 528
. . . . . . . . . . . . . . . . . . . . . . . .
Used engine oil 530
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . .
Checking the engine oil level 530
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the engine coolant level 534
. . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the radiator and condenser 536
. . . . . . . . . . . . . . . . . . . . . . .
Spark plugs 537
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . .

ENGINE
520
SPECIFICATIONS (GS430)
– GENERALModel
4.3 L V8 (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 (262.0 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
Unleaded gasoline only
Octane rating91 (Research octane number 96) or higher