engine Lexus GX460 2021 Owner's Manual /

553
GX460_OM_OM60T19U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If your vehicle overheats
Stop the vehicle in a safe place and turn off the air conditioning system, and
then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled down suff iciently, inspect the hoses and radiator
core (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact your Lexus
dealer.
The following may indicate that your vehicle is overheating.
●The needle of the engine coolant temperature gauge ( P. 90) enters the
red zone or a loss of engine power is experienced. (For example, the vehicle
speed does not increase.)
●Steam is coming from under the hood.
Correction procedures
1
2
3
1
2

5547-2. Steps to take in an emergency
GX460_OM_OM60T19U_(U)
The coolant level is satisfactory if it is between the “F” and “L” lines on the res-
ervoir.Reservoir
“F”
“L”
Radiator cap
Add coolant if necessary.
Water can be used in an emergency if
coolant is unavailable.
Start the engine and turn the air conditio ning system on to check that the radi-
ator cooling fans operate and to check for coolant leaks from the radiator or
hoses.
The fans operate when the air conditioning system is turned on immediately after a
cold start. Confirm that the fans are operating by checking the fan sound and air flow.
If it is difficult to check these, turn the air conditioning system on and off repeatedly.
(The fans may not operate in freezing temperatures.)
If the fans are not operating:
Stop the engine immediately an d contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.
4
1
2
3
4
5
6
7

5557-2. Steps to take in an emergency
GX460_OM_OM60T19U_(U)
7
When trouble arises
WARNING
■When inspecting under the hood of your vehicle
Observe the following precautions.
Failure to do so may result in serious injury such as burns.
●If steam is seen coming from under the h ood, do not open the hood until the steam
has subsided. The engine compartment may be very hot.
●Keep hands and clothing (especially a tie, a scarf or a muffler) away from the fans and
belts. Failure to do so may cause the hands or clothing to be caught, resulting in seri-
ous injury.
●Do not loosen the radiator cap or the cool ant reservoir cap while the engine and radi-
ator are hot. High temperature steam or coolant could spray out.
NOTICE
■When adding engine coolant
Add coolant slowly after the engine has cool ed down sufficiently. Adding cool coolant
to a hot engine too quickly can cause damage to the engine.
■To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreig n matter (such as sand or dust etc.).
●Do not use any coolant additive.

556
GX460_OM_OM60T19U_(U)7-2. Steps to take in an emergency
If the vehicle becomes stuck
Stop the engine. Set the parking br
ake and shift the shift lever to P.
Remove the mud, snow or sand from around the stuck tire.
Place wood, stones or some other mate rial under the tires to help provide
traction.
Restart the engine.
Lock the center differential. ( P. 345)
Shift the shift lever to the D or R positi on and release the parking brake. Then,
while exercising caution, depress the accelerator pedal.
■When it is difficult to free the vehicle
Turn off TRAC/Active TRAC/VSC/Trailer Sway Control if these functions are hamper-
ing your attempts to free the vehicle. ( P. 357)
Carry out the following procedures if the tires spin or the vehicle becomes
stuck in mud, dirt, or snow:
Press to turn off TRAC/Active TRAC/VSC/
Trailer Sway Control.
1
2
3
4
5
6

562
GX460_OM_OM60T19U_(U)8-1. Specifications
■Engine number
The engine number is stamped on
the engine block as shown.
*: The engine oil capacity is a reference quantity to be used when changing the engine
oil. Warm up and turn off the engine, wait more than 5 minutes, and check the oil level
on the dipstick.
Engine
Model4.6 L 8-cylinder (1UR-FE)
Type8-cylinder V type, 4-cycle, gasoline
Bore and stroke3.70  3.27 in. (94.0  83.0 mm)
Displacement281.2 cu.in. (4608 cm3)
Valve clearanceAutomatic adjustment
Drive belt tensionAutomatic adjustment
Fuel
Fuel typeUnleaded gasoline only
Octane rating91 (Research Octane Number 96) or higher
Fuel tank capacity (Reference)23.0 gal. (87 L, 19.1 Imp.gal.)
Lubrication system
Oil capacity
(Drain and refill — reference*)
With filter
Without filter8.2 qt. (7.8 L, 6.9 Imp.qt.)
7.8 qt. (7.4 L, 6.5 Imp.qt.)

GX460_OM_OM60T19U_(U)
5638-1. Specifications
8
Vehicle specifications
■Engine oil selection
“Toyota Genuine Motor Oil” is used in your Lexus vehicle. Use Lexus
approved “Toyota Genuine Motor Oil” or equivalent to satisfy the following
grade and viscosity.
Oil grade: ILSAC GF-5 multigrade engine oil
Recommended viscosity: SAE 0W-20
SAE 0W-20 is the best choice for
good fuel economy and good start-
ing in cold weather.
If SAE 0W-20 is not available, SAE
5W-20 oil may be used. However, it
must be replaced with SAE 0W-20
at the next oil change.
Oil viscosity (0W-20 is explained here as an example): • The 0W in 0W-20 indicates the characteristic of the oil which allows cold startability. Oils with a lower value be fore the W allow for easier starting of
the engine in cold weather.
• The 20 in 0W-20 indicates the viscos ity characteristic of the oil when the
oil is at high temperature. An oil with a higher viscosity (one with a higher
value) may be better suited if the vehicle is operated at high speeds, or
under extreme lo ad conditions.
How to read oil container label:
The International Lubricant Specifi-
cation Advisory Co mmittee (ILSAC)
Certification Mark is added to some
oil containers to help you select the
oil you should use.
Outside temperature

GX460_OM_OM60T19U_(U)
5658-1. Specifications
8
Vehicle specifications
*: Your Lexus vehicle is filled with “Toyota Genuine Differential Gear Oil” at the factory.Use Lexus approved “Toyota Genuine Differ ential Gear Oil” or an equivalent of
matching quality to satisfy the above specification. Please contact your Lexus dealer
for further details.
*: Your Lexus vehicle is filled with “Toyota Genuine Differential Gear Oil” at the factory. Use Lexus approved “Toyota Genuine Differ ential Gear Oil” or an equivalent of
matching quality to satisfy the above specification. Please contact your Lexus dealer
for further details.
Electrical system (battery)
Specific gravity reading at
68 F (20 C):12.3 V or higher
In the case the voltage is less than standard,
charge battery.
(Voltage is checked 20 minutes after the engine)
Charging rates5 A max.
Front differential
Oil capacity1.48 qt. (1.40 L, 1.23 Imp.qt.)
Oil type and viscosity*Toyota Genuine Differential Gear Oil LT 75W-85
GL-5 or equivalent
Rear differential
Oil capacity2.85 qt. (2.70 L, 2.38 Imp.qt.)
Oil type and viscosity*Toyota Genuine Differential Gear Oil LT 75W-85
GL-5 or equivalent

GX460_OM_OM60T19U_(U)
5678-1. Specifications
8
Vehicle specifications
*1: Minimum pedal clearance when depressed with a force of 110 lbf (490 N, 50 kgf)
while the engine is running
*2: Parking brake pedal travel when pulled up with a force of 44.1 lbf (196 N, 20.0 kgf)
Brakes
Pedal clearance*13.5 in. (90 mm) Min.
Pedal free play0.04  0.24 in. (1  6 mm)
Brake pad wear limit0.04 in. (1.0 mm)
Parking brake lining wear limit0.04 in. (1.0 mm)
Parking brake pedal
travel
*25  7 clicks
Fluid typeSAE J1703 or FMVSS No. 116 DOT 3
SAE J1704 or FMVSS No. 116 DOT 4
Chassis lubrication (Propeller shafts)
SpiderLithium base chassi s grease, NLGI No.2
Slide yokeMolybdenum-disulfide lith ium base chassis grease,
NLGI No.2 or lithium base chassis grease, NLGI No.2

570
GX460_OM_OM60T19U_(U)8-1. Specifications
Fuel information
■Gasoline quality
In very few cases, driveabilit
y problems may be caused by th e brand of gasoline you are
using. If driveability problems persist, try ch anging the brand of gasoline. If this does not
correct the problem, consult your Lexus dealer.
■Recommendation of the use of gasoline containing detergent additives
●Lexus recommends the use of gasoline that contains detergent additives to avoid the
build-up of engine deposits.
●All gasoline sold in the U.S.A. contains minimum detergent additives to clean and/or
keep clean intake systems, per EPA’s lowest additives concentration program.
●Lexus strongly recommends the use of Top Tier Detergent Gasoline. For more informa-
tion on Top Tier Detergent Gasoline and a lis t of marketers, please go to the official
website www.toptiergas.com.
■Recommendation of the use of low emissions gasoline
Gasolines containing oxygenates such as et hers and ethanol, as well as reformulated
gasolines, are available in some cities. Thes e fuels are typically acceptable for use, pro-
viding they meet other fuel requirements.
Lexus recommends these fuels, since the form ulations allow for reduced vehicle emis-
sions.
You must only use unleaded gasoline.
Select premium unleaded gasoline with an octane rating of 91 (Research
Octane Number 96) or higher requir ed for optimum engine performance
and fuel economy. If the octane rating is less than 91, damage to the engine
may occur and may void the vehicle warranty.
At minimum, the gasoline you use shou ld meet the specifications of ASTM
D4814 in the U.S.A..

GX460_OM_OM60T19U_(U)
5718-1. Specifications
8
Vehicle specifications
■Non-recommendation of the use of blended gasoline
●If you use gasohol in your vehicle, be sure that it has an octane rating no lower than 91.
●Lexus does not recommend the use of gasoline containing methanol.
■Non-recommendation of the use of gasoline containing MMT
Some gasoline contains an octane enhancing additive called MMT (Methylcy clopenta-
dienyl Manganese Tricarbonyl).
Lexus does not recommend the use of gasoline that contains MMT. If fuel containing
MMT is used, your emission control system may be adversely affected.
The malfunction indicator lamp on the instru ment cluster may come on. If this happens,
contact your Lexus dealer for service.
■If your engine knocks
●Consult your Lexus dealer.
●You may occasionally notice light knocking for a short time while accelerating or driv-
ing uphill. This is normal and there is no need for concern.
●Use only gasoline containing up to 15% etha-
nol.
DO NOT use any flex-fuel or gasoline that
could contain more than 15% ethanol, includ-
ing from any pump labeled E30, E50, E85
(which are only some examples of fuel con-
taining more than 15% ethanol).DO NOT use gasoline con-
taining more than 15% ethanol.
(30% ethanol)
(50% ethanol)
(85% ethanol)