2013 Lexus GS300h engine

7426-3. Do-it-yourself maintenance
GS450h_300h_OM_OM30D53E_(EE)
Adding engine oil
If the oil level is below or near the low level mark, add engine oil
of the same type as that already in the engine.
Make sure to check the oil type and prepare the items needed
before adding oil.
Remove the oil filler cap by turning it counterclockwise.
Add engine oil slowly, checking the dipstick.
Install the oil filler cap by turning it clockwise.
GS300hGS450h
Engine oil selectionP. 9 3 1
Oil quantity (Low  Full) 1.5 L (1.6 qt., 1.3 Imp.qt.)
Items Clean funnel
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743 6-3. Do-it-yourself maintenance
6
Maintenance and care
GS450h_300h_OM_OM30D53E_(EE)
Engine oil consumption
A certain amount of engine oil will be consumed while driving. In the fol-
lowing situations, oil consumption may increase, and engine oil may need to
be refilled in between oil maintenance intervals.
When the engine is new, for example directly after purchasing the vehicle
or after replacing the engine
If low quality oil or oil of an inappropriate viscosity is used
When driving at high engine speeds or with a heavy load, when towing, or
when driving while accelerating or decelerating frequently
When leaving the engine idling for a long time, or when driving frequently
through heavy traffic
CAUTION
Used engine oil
Used engine oil contains potentially harmful contaminants which may
cause skin disorders such as inflammation and skin cancer, so care should
be taken to avoid prolonged and repeated contact. To remove used engine
oil from your skin, wash thoroughly with soap and water.
Dispose of used oil and filters only in a safe and acceptable manner. Do
not dispose of used oil and filters in household trash, in sewers or onto the
ground.
Call any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional, service station or auto parts store for information
concerning recycling or disposal.
Do not leave used engine oil within the reach of children.
NOTICE
To prevent serious engine damage
Check the oil level on a regular basis.
When replacing the engine oil
Be careful not to spill engine oil on the vehicle components.
Avoid overfilling, or the engine could be damaged.
Check the oil level on the dipstick every time you refill the vehicle.
Be sure the engine oil filler cap is properly tightened.

7446-3. Do-it-yourself maintenance
GS450h_300h_OM_OM30D53E_(EE)
The coolant level is satisfactory if it is between the “FULL” and
“LOW” lines on the reservoir when the hybrid system is cold.
Engine coolant reservoir
Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the “LOW” line, add coolant up to the
“FULL” line. (P. 915)
Coolant
GS300hGS450h
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7466-3. Do-it-yourself maintenance
GS450h_300h_OM_OM30D53E_(EE)
Coolant selection
Only use “Toyota Super Long Life Coolant” or a similar high quality eth-
ylene glycol based non-silicate, non-amine, non-nitrite, and non-borate cool-
ant with long-life hybrid organic acid technology.
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50%
deionized water. (Minimum temperature: -35C [-31F])
For more details about coolant, contact any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.
If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine/power control unit coolant reser-
voir caps, drain cock and water pump.
If you cannot find a leak, have any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional, test the cap and check for
leaks in the cooling system.
CAUTION
When the hybrid system is hot
Do not remove the engine/power control unit coolant reservoir caps or the
coolant inlet cap. (P. 9 2 1 )
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing serious injuries, such as burns.
NOTICE
When adding coolant
Coolant is neither plain water nor straight antifreeze. The correct mixture of
water and antifreeze must be used to provide proper lubrication, corrosion
protection and cooling. Be sure to read the antifreeze or coolant label.
If you spill coolant
Be sure to wash it off with water to prevent it from damaging parts or paint.

7486-3. Do-it-yourself maintenance
GS450h_300h_OM_OM30D53E_(EE)
If any washer does not work or
the warning message appears on
the multi-information display,
the washer tank may be empty.
Add washer fluid.
Washer fluid
CAUTION
When adding washer fluid
Do not add washer fluid when the hybrid system is hot or operating as
washer fluid contains alcohol and may catch fire if spilled on the engine
etc.
NOTICE
Do not use any fluid other than washer fluid
Do not use soapy water or engine antifreeze instead of washer fluid.
Doing so may cause streaking on the vehicle’s painted surfaces.
Diluting washer fluid
Dilute washer fluid with water as necessary.
Refer to the freezing temperatures listed on the label of the washer fluid
bottle.

7826-3. Do-it-yourself maintenance
GS450h_300h_OM_OM30D53E_(EE)
Checking and replacing fuses
Turn the power switch off.
After a system failure, see “Fuse layout and amperage ratings”
for details about which fuse to check. (P. 787)
Open the fuse box cover.
Engine compartment:
Remove the engine compart-
ment cover (P. 740) and
remove all of the clips.
Push the tabs on either side to
detach the lock and lift the lid
off while pulling the lock
plate.
When installing the lid, check
that the lock plate and the tabs
on either side are connected cor-
rectly.
If any of the electrical components do not operate, a fuse may have
blown. If this happens, check and replace the fuses as necessary.
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787 6-3. Do-it-yourself maintenance
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Maintenance and care
GS450h_300h_OM_OM30D53E_(EE)
Engine compartment
Fuse layout and amperage ratings
FuseAmpereCircuit
1IGN10Starting system
2INJ10Multiport fuel injection system/sequen-
tial multiport fuel injection system
3EFI NO.210Air intake system, exhaust system
4IG2 MAIN20IGN, GAUGE, INJ, AIR BAG, IG2
NO.1, LH-IG2
5EFI MAIN25
Multiport fuel injection system/sequen-
tial
multiport fuel injection system, EFI
NO.2
6A/F15Air flow sensor
7EDU20Multiport fuel injection system/sequen-
tial multiport fuel injection system

801 6-3. Do-it-yourself maintenance
6
Maintenance and care
GS450h_300h_OM_OM30D53E_(EE)
The upper part of the 12-volt battery*
*: When one or more of the fuses in this unit are blown, the unit needs to be
replaced as a whole.
FuseAmpereCircuit
1EPB30Parking brake
2LUG-J/B BATT40Luggage compartment junction block
3EPS80Electric power steering
4ARS80Dynamic Rear Steering
5MAIN220Engine compartment junction block