engine coolant LEXUS RC350 2021 Owner's Manual

3257-2. Steps to take in an emergency
7
When trouble arises
WARNING
●RC350/RC300 AWD: While the
engine and radiator are hot, do not
loosen or remove the coolant reser-
voir cap or coolant inlet cap. (The
coolant inlet cap is located under the
engine cover.)
High temperature steam or coolant
could spray out.
●RC300: While the engine and radia-
tors are hot, do not loosen or remove
the coolant reservoir cap, coolant inlet
cap, or intercooler coolant reservoir
cap.
High temperature steam or coolant
could spray out.
NOTICE
■When adding engine coolant
Add coolant slowly after the engine has
cooled down sufficiently. Adding cool
coolant to a hot engine too quickly can
cause damage to the engine.
■To prevent damage to the cooling sys-
tem
Observe the following precautions:
●Avoid contaminating the coolant with
foreign matter (such as sand or dust
etc.).
●Do not use any coolant additive.

3328-1. Specifications
*: The fluid capacity is a reference quantity. If replacement is necessary, contact your Lexus dealer.
■Spark plug
Cooling system
Capacity*
RC350/RC3
00 AWD10.0 qt. (9.5 L, 8.4 Imp. qt.)
RC300
Gasoline engine
8.5 qt. (8.0 L, 7.0 Imp. qt.)
Intercooler
3.3 qt. (3.1 L, 2.7 Imp. qt.)
Coolant type
Use either of the following:
 “Toyota Super Long Life Coolant”
 Similar high-quality ethylene glycol-based non-silicate,
non-amine, non-nitrite, and non-borate coolant with
long-life hybrid orga nic acid technology
Do not use plain water alone.
Ignition system (spark plug)
RC350/RC300 AWDRC300
MakeDENSO FK20HBR8NGK DILFR7K9G
Gap0.031 in. (0.8 mm)0.035 in. (0.9 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.
Electrical system (battery)
Open voltage at 68°F (20°C):
12.3 V or higher
If the voltage is lower than the standard value,
charge the battery.
(Voltage is checked 20 minutes after the engine
and all lights are turned off.)
Charging rates5 A max.

3458-1. Specifications
8
Vehicle specifications
cornering (turning) traction.
■Temperature A, B, C
The temperature grades are A (the
highest), B, and C, representing the
tire’s resistance to the generation of
heat and its ability to dissipate heat
when tested under controlled condi-
tions on a specified indoor laboratory
test wheel.
Sustained high temperature can cause the
material of the tire to degenerate and
reduce tire life, and excessive temperature
can lead to sudden tire failure. Grade C corresponds to
a level of perfor-
mance which all passenger car tires must
meet under the Fede ral Motor Vehicle
Safety Standard No. 109.
Grades B and A represent higher levels of
performance on the laboratory test wheel
than the minimum required by law.
Warning: The temperature grades of a tire
assume that it is properly inflated and not
overloaded.
Excessive speed, unde rinflation, or exces-
sive loading, either separately or in combi-
nation, can cause heat buildup and
possible tire failure.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pressure
Tire pressure when the vehicle has been parked for
three hours or more, or has not been driven more
than 1 mile or 1.5 km under that condition
Maximum inflation pressureThe maximum cold inflated pressure to which a tire
may be inflated, shown on the sidewall of the tire
Recommended inflation pressureCold tire inflation pressure recommended by a
manufacturer
Accessory weight
The combined weight (in excess of those standard
items which may be replaced) of automatic trans-
mission, power steering, power brakes, power win-
dows, power seats, radio and heater, to the extent
that these items are available as factory-installed
equipment (whether installed or not)
Curb weight
The weight of a motor vehicle with standard equip-
ment, including the maximum capacity of fuel, oil
and coolant, and if so equipped, air conditioning
and additional weight optional engine

388Alphabetical Index
If the engine will not start .........................314
If your vehicle has to be stopped in an
emergency ................................................286
Ignition switch (engine switch) ............. 127
Overheating................................................. 322
Tachometer ..................................................... 66
Engine coolant Capacity ......................................................... 332
Checking .......................................................260
Preparing and checking before winter.........................................................................205
Engine coolant temperature gauge ....... 66
Engine immobilizer system ........................ 56
Engine oil Capacity .........................................................330
Checking .......................................................258
Preparing and checking before winter.........................................................................205
Warning light ............................................... 296
Engine oil maintenance data .................. 260
Engine oil pressure gauge ...........................74
Engine oil temperature gauge ...................74
Engine switch .................................................. 127 Auto power off function .......................... 130
Changing the engine switch modes.. 129
If your vehicle has to be stopped in an
emergency ................................................286
EPS (Electric Power Steering) ................201 Warning light ............................................... 297
Event data recorder (EDR) ............................6
F
First-aid kit storage belt ............................ 229
Flat tire Tire pressure warning system .............268
Vehicles with a spare tire ...................... 307
Floor mats ...........................................................22
Fluid Automatic transmission .......................... 333
Brake.................................................... 262, 334
Washer ........................................................... 264
Footwell light ................................................. 225 Front passenger occupant classification
system .............................................................. 36
Front position lights Wattage ......................................................... 338
Front seats Adjustment ....................................................... 99
Cleaning .........................................................245
Correct driving posture ............................ 23
Driving position memory ........................ 102
Head restraints............................................. 105
Memory recall function............................ 104
Power easy access system .................... 102
Seat heaters .................................................. 223
Seat position memory .............................. 102
Seat ventilators ............................................ 223
Front side marker light Light switch .....................................................142
Front turn signal lights Replacing light bulbs ................................282
Turn signal lever .......................................... 136
Wattage ......................................................... 338
Fuel Capacity ........................................................ 330
Fuel gauge ........................................................ 66
Fuel pump shut off system..................... 294
Information ....................................................339
Refueling.......................................................... 155
Type ................................................................. 330
Warning light ...............................................299
Fuel consumption Average fuel economy .............................. 73
Current fuel consumption ........................ 73
Fuel filler door If the fuel filler do or cannot be opened
........................................................................... 316
Refueling.......................................................... 155
Fuel gauge ......................................................... 66
Fuel pump shut off system........................ 294
Fuses ................................................................. 278
G
Garage door opener ................................. 232

389Alphabetical Index
Gauges ............................................................... 66
Gear Position....................................................75
G-force................................................................74
Glove box ........................................................227
Glove box light ............................................. 228
H
Head restraints .............................................. 105
Headlight aim ................................................280
HeadlightsAutomatic High Beam system.............. 144
Light switch ..................................................... 142
Replacing light bulbs................................ 282
Wattage..........................................................338
Heated steering wheel .............................. 223
Heaters Automatic air conditioning system .....215
Heated steering wheel............................ 223
Outside rear view mirrors ...................... 219
Seat heaters .................................................. 223
High mounted stoplight Replacing light bulbs................................ 282
Hill-start assist control .................................201
Hood Open ............................................................... 255
Hooks Cargo hooks................................................ 229
Coat hooks ................................................... 230
Retaining hooks (floor mat)......................22
Horn ................................................................... 109
I
I/M test ............................................................ 252
Identification Engine ............................................................. 329
Vehicle ............................................................ 328
Ignition switch (engine switch)................. 127 Auto power off function .......................... 130
Changing the engine switch modes.. 129
If your vehicle has to be stopped in an
emergency ................................................286 Illuminated entry system ........................... 226
Indicators ........................................................... 64
Initialization
Items to initialize .......................................... 361
Maintenance.................................... 248, 260
Power windows ............................................. 112
Tire pressure warning system .............269
Inside rear view mirror ............................... 109
Instrument panel light co ntrol ..................... 71
Intercooler...................................................... 262
Intercooler coolant Capacity ......................................................... 332
Checking ...................................................... 260
Interior lights.................................................. 225 Front interior light ...................................... 225
Rear interior light........................................ 225
Intuitive parking assist Warning message ...................................... 187
J
JackPositioning a floor jack ............................255
Vehicle-equipped jack ...........................307
Jack handle .................................................... 307
Jam protection function Moon roof ........................................................ 115
Power windows ............................................. 112
K
Keyless entrySmart access system with push-button start ...................................................................95
Wireless remote control ...........................86
Keys Battery-saving function..............................96
Electronic key .................................................84
Engine switch ................................................. 127
If the electronic key does not operate properly .........................................................317
If you lose your keys .................................. 316
Key number plate .........................................84

391Alphabetical Index
Moon roofDoor lock linked moon roof operation............................................................................ 115
Jam protection function............................. 115
Operation..........................................................114
Multi-information display .............................. 71 Audio system-linked display................... 76
Boost gauge.....................................................74
Drive information ...........................................73
Drive information 1/Drive information 2/Drive information 3..............................73
Driving assist system information display ............................................................................ 76
Dynamic radar cruise control ............... 176
Eco Driving Indicator ..................................74
Engine oil pressure gauge ........................74
Engine oil temperature gauge ................74
Gear Position ................................................. 75
G-force...............................................................74
LDA (Lane Departure Alert with steering control) ............................................................171
Menu icons .......................................................72
Meter control switches ...............................72
Navigation system-linked display ........ 76
Settings .............................................................. 76
Tire pressure ....................................... 75, 268
Units .................................................................... 75
Vehicle sway warning ................................ 75
Warning message display ....................... 76
Warning messages ..................................303
N
Navigation system-linked display.............76
Noise from under vehicle .............................. 5
O
“ODO TRIP” switch ...................................... 70
Odometer ......................................................... 70
Odometer and trip meter display “ODO TRIP” switch .................................... 70 Oil
Engine oil....................................................... 330
Front differential oil............. .......................333
Rear differential oil......... ..................... .......333
Opener Fuel filler door ............................................... 155
Hood ................................................................255
Trunk ................................................................... 92
Outer foot lights Location .......................................................... 225
Outside rear view mirrors Adjustment ....................................................... 110
BSM (Blind Spot Monitor)....................... 191
Folding.................................................................. 111
Linked mirror functi on when reversing111
Mirror position memory .......................... 102
Outside rear view mirror defoggers .219
RCTA function ............................................... 191
Outside temperature.................................... 66
Overheating .................................................. 322
P
Paddle shift switches ..........................133, 134
Panic mode ....................................................... 86
Parking brake Operation ........................................................137
Parking brake engaged warning buzzer........................................................................... 138
Warning light .............................................. 300
Warning message ...................................... 138
Parking lights Light switch .....................................................142
Replacing light bulbs ................................282
PCS (Pre-Collision System) Function ............................................................162
PCS OFF switch ......................................... 164
Warning light .............................................. 298
Warning message .................................... 303
Personal lights............................................... 225
Power control unit coolant Preparing and checking before winter......................................................................... 205

395Alphabetical Index
Snow mode ....................................................133
Trip meters ........................................................ 70
Trunk ...................................................................... 91 Smart access system with push-button start ................................................................... 92
Trunk features.............................................. 229
Trunk grip ......................................................... 93
Trunk light......................................................... 93
Trunk opener main switch ....................... 94
Trunk opener switch ................................... 92
Wireless remote control........................... 93
Trunk light .......................................................... 93
Turn signal lights Replacing light bulbs................................ 282
Turn signal lever ...........................................136
Wattage..........................................................338
V
Vanity lights......................................................231
Vanity mirrors .................................................231
Variable Gear Ratio Steering (VGRS)201
VDIM (Vehicle Dynami cs Integrated Man-
agement)...................................................... 202
Vehicle data recording .... ............................... 5
Vehicle Dynamics Integrated Manage- ment (VDIM).............................................. 202
Vehicle identification number ................ 328
Vehicle Stability Control (VSC) .............201
Vehicle sway warning display ....................75
Ventilators (seat ventilators)................... 223
VGRS (Variable Gear Ratio Steering)201
VSC (Vehicle Stabilit y Control) .............201
W
Warning buzzer
Open door warning................................. 299
Warning buzzers Approach warning....................................... 181
Brake hold...................................................... 301
Brake Override System ......................... 297
Downshifting ....................................... 134, 135 Drive-Start Control................................... 297
Electric power steering........................... 297
High coolant temperature.....................295
LDA (Lane Departure Alert with steering
control) ......................................................... 169
LDA (Lane Departure Alert) .............. 298
Low engine oil pressure.........................296
Open door ............................................. 89, 90
Open window ................................................ 113
Pre-collision braking ................................. 163
Seat belt ..........................................................299
Warning lights............................................... 295 ABS ................................................................... 297
Brake hold operated indicator ............ 301
Brake Override System ......................... 297
Brake system................................................295
Charging system........................................296
Drive-Start Control................................... 297
Electric power steering........................... 297
High coolant temperature.....................295
LDA indicator ............................................. 298
Low engine oil pressure.........................296
Low fuel level ...............................................299
Malfunction indicator lamp ...................296
Master warning light................................ 300
Open door warning .................................299
Parking brake indicator ......................... 300
Pre-collision system................................. 298
Seat belt reminder light...........................299
Slip indicator ................................................ 298
SRS ....................................................................296
Tire pressure ............................................... 300
Warning message display............................76
Warning messages ..................................... 303
Washer Checking ....................................................... 264
Preparing and checking before winter......................................................................... 205
Switch.................................................................147
Washing and waxing.................................. 242
Weight Cargo capacity ............................................ 125