cooling Lexus GS300 2003 Engine

± 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.

± 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 PUMP SHUT OFF SYSTEM
The fuel pump shut off system stops supplying fuel to the
engine to minimize the risk of fuel leakage when the engine
stalls or an airbag inflates upon collision. To restart the engine
after the fuel pump shut off system activates, turn the ignition
switch to ªACCº or ªLOCKº once and start it.
CAUTION
Inspect the ground under the vehicle before restarting
the engine. If you find that liquid has leaked onto the
ground, it is the fuel system that has been damaged and
it is in need of repair. In this case, do not restart the
engine.
FACTS ABOUT ENGINE OIL
CONSUMPTION
Functions of engine oil
Engine oil has the primary function of lubricating and cooling
the inside of the engine, and plays a major role in maintaining
the engine in proper working order.
Engine oil consumption
It is normal that an engine should consume some engine
oil during normal engine operation. The causes of oil
consumption in a normal engine are as follows.
Oil is used to lubricate pistons, piston rings and cylinders.
A thin film of oil is left on the cylinder wall when a piston
moves downwards in the cylinder. High negative pressure
generated when the vehicle is decelerating sucks some of
this oil into the combustion chamber. This oil as well as
some part of the oil film left on the cylinder wall is burned by
the high temperature combustion gases during the
combustion process.
Oil is also used to lubricate the stems of the intake valves.
Some of this oil is sucked into the combustion chamber
together with the intake air and is burned along with the fuel.
High temperature exhaust gases also burn the oil used to
lubricate the exhaust valve stems.

Look at the see±through coolant reservoir when the
engine is cold. The coolant level is satisfactory if it is
between theºFULLº and ºLOWº lines on the reservoir. If
the level is low, add ethylene±glycol 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 ºLOWº
line, add coolant. Bring the level up to the ºFULLº 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 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 ªToyota
Genuine Long Life Coolantº in your Lexus vehicle. In order to
avoid technical problems, we strongly recommend using
ªToyota Genuine Long Life Coolantº 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 252 or 255.
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 ªToyota Genuine Long
Life Coolantº 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
ªToyota Genuine Long Life Coolantº 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.