2018 LEXUS RCF coolant level

952. Instrument cluster
2
Instrument cluster
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
The meters and display illuminate when
The engine switch is in IGNITION ON mode. ■
Instrument panel brightness adjustment
The instrument panel brightness levels when the tail lights are on and off can be adjusted
individually. However, when the surroundings are bright (dayti me, etc.), turning on the tail
lights will not change the inst rument panel brightness. At th is time, any adjustments made
to the instrument panel brightness levels will be applied to both settings at once. ■
Outside temperature display ●
In the following situations, the correct outside temperature may not be displayed, or the
display may take longer than normal to change.
• When stopped, or driving at low speeds (less than 12 mph [20 km/h])
• When the outside temperature has changed suddenly (at the entrance/exit of a
garage, tunnel, etc.) ●
When “_ _”or “E” is displayed, the system may be malfunctioning.
Take your vehicle to your Lexus dealer. ■
Pop-up display ●
In some situations, such as when a switch operation is performed, a pop-up display will
be temporarily displayed on the multi-info rmation display or the odometer/trip meter
screen (F SPORT models). ●
Some pop-up displays can be set on/off. (  P. 111)■
Customization
The meter display can be customized on the multi-information display. (  P. 111)
NOTICE ■
To prevent damage to the engine and its components●
Do not let the indicator needle of the tachometer enter the red zone, which indicates
the maximum engine speed. ●
The engine may be overheating if the engine coolant temperature gauge is in the red
zone (H). In this case, immediately stop the vehicle in a safe place, and check the
engine after it has cooled completely. (  P. 526)

102 2. Instrument cluster
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Instrument panel brightness adjustment
The instrument panel brightness levels when the tail lights are on and off can be adjusted
individually. However, when the surroundings are bright (dayti me, etc.), turning on the tail
lights will not change the inst rument panel brightness. At th is time, any adjustments made
to the instrument panel brightness levels will be applied to both settings at once. ■
Dimming the analog speedometer lighting
The analog speedometer lighting will be dimm ed when the ambient light is bright, such
as during the daytime, and SPORT S or SPORT S+ mode is selected.■
Outside temperature display ●
In the following situations, the correct outside temperature may not be displayed, or the
display may take longer than normal to change.
• When stopped, or driving at low speeds (less than 12 mph [20 km/h])
• When the outside temperature has changed suddenly (at the entrance/exit of a
garage, tunnel, etc.) ●
When “  ” or “E” is displayed, the sy stem may be malfunctioning.
Take your vehicle to your Lexus dealer. ■
Pop-up display ●
In some situations, such as when a switch operation is performed, a pop-up display will
be temporarily displayed on the multi-information display.●
Some pop-up displays can be set on/off. (  P. 129)■
Liquid crystal display
Small spots or light spots may appear on the display. This phenomenon is characteristic
of liquid crystal displays, and there is no problem continuing to use the display.■
Customization
The meter display can be customized on the multi-information display. (  P. 129)
NOTICE ■
To prevent damage to the engine and its components●
Do not let the indicator of the tachometer enter the red zone, as it represents the
engine speed range which exceeds the maximum safe engine speed. ●
In the following situations, th e engine may be overheating. In this case, immediately
stop the vehicle in a safe place, and check the engine after it has cooled completely.
(  P. 526)
• The engine coolant temperature gauge indicator ( ) is in the red zone and flash-
ing.
• The engine oil temperature gauge indicator ( ) is in the red zone and flashing.

3876-2. Maintenance
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 6
Maintenance and care
General maintenance Listed below are the general maintenanc e items that should be performed at
the intervals specified in the “Warranty and Service Guide” or “Owner’s
Manual Supplement”. It is recommende d that any problem you notice should
be brought to the attention of your Lexu s dealer or qualified service shop for
advice.
Engine compartment Items Check points
Battery Check the indicator (if equipped) and connections.
(  P. 408)
Brake fluid Is the brake fluid at the correct level? (  P. 407)
Engine/intercooler coolant Is the engine/intercooler c oolant at the correct level?
(  P. 404)
Engine oil Is the engine oil at the correct level? (  P. 400)
Exhaust system There should not be any fumes or strange sounds.
Radiator, condenser and
intercooler radiator The radiator, condenser and intercooler radiator
should be free from foreign objects. (  P. 406)
Washer fluid Is there sufficient washer fluid? (  P. 411)

391
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 6
Maintenance and care 6-3. Do-it-yourself maintenance
Do-it-yourself service precautions If you perform maintenance by yourself, be sure to follow the correct proce-
dure as given in these sections. Items Parts and tools
Battery condition
(  P. 408) •Warm water • Baking soda •Grease
• Conventional wrench (for terminal clamp bolts)
Brake fluid level
(  P. 407) • SAE J1703 or FMVSS No.116 DOT 3 brake fluid
• SAE J1704 or FMVSS No.116 DOT 4 brake fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine/intercooler
coolant level
(  P. 404) • “Toyota Super Long Life Coolan t” or a similar high quality
ethylene glycol-based non-silicate, non-amine, non-nitrite
and non-borate coolant with long-life hybrid organic acid
technology
For the U.S.A.:
“Toyota Super Long Life Coolant” is pre-mixed with 50%
coolant and 50% deionized water.
For Canada:
“Toyota Super Long Life Cool ant” is pre-mixed with 55%
coolant and 45% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
(  P. 400) • “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses
(  P. 429) • Fuse with same amperage rating as original
Light bulbs
(  P. 432) • Bulb with same number and wattage rating as original
• Phillips-head screwdriver •Flathead sc rewdriver
•Wrench
Radiator, condenser
and intercooler radi-
ator (  P. 406)

Tire inflation pres-
sure (  P. 420) • Tire pressure gauge • Compressed air source
Washer fluid
(  P. 411) • Water or washer fluid containing antifreeze (for winter use)
• Funnel (used only for adding water or washer fluid)

3976-3. Do-it-yourself maintenance
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 6
Maintenance and care 
RC350/RC300 AWD
Engine compartment
Fuse boxes (  P. 429)
Battery (  P. 408)
Engine oil level dipstick
(  P. 400)
Engine coolant reservoir
(  P. 404)
Engine oil filler cap (  P. 402) Brake fluid reservoir (  P. 407)
Washer fluid tank (  P. 411)
Electric cooling fans
Condenser (  P. 406)
Radiator (  P. 406)1
2
3
4
5 6
7
8
9
10

398 6-3. Do-it-yourself maintenance
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)
RC300
Fuse boxes (  P. 429)
Battery (  P. 408)
Engine oil level dipstick
(  P. 400)
Engine oil filler cap (  P. 402)
Engine coolant reservoir
(  P. 404)
Brake fluid reservoir (  P. 407) Washer fluid tank (  P. 411)
Electric cooling fans
Condenser (  P. 406)
Intercooler radiator (  P. 406)
Radiator (  P. 406)
Intercooler coolant reservoir
(  P. 404)1
2
3
4
5
6 7
8
9
10
11
12

3996-3. Do-it-yourself maintenance
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 6
Maintenance and care 
RC F
Fuse boxes (  P. 429)
Battery (  P. 408)
Engine oil level dipstick
(  P. 400)
Engine coolant reservoir
(  P. 404)
Engine oil filler cap (  P. 402) Brake fluid reservoir (  P. 407)
Washer fluid tank (  P. 411)
Electric cooling fans
Condenser (  P. 406)
Radiator (  P. 406)1
2
3
4
5 6
7
8
9
10

404 6-3. Do-it-yourself maintenance
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Engine coolant reservoir
The coolant level is satisfactory if it is between the “FULL” and “LOW” lines on
the reservoir when the engine is cold.
Coolant 
RC350/RC300 AWD 
RC300
RC F
Reservoir cap
“FULL” line
“LOW” line If the level is on or below the “LOW” lin e, add coolant up to the “FULL” line.
(  P. 526) 1
2
3