Acura RLX (2018 year). Manual - part 32

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Maintenance Under the Hood

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Recommended Engine Oil

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Recommended Engine Oil

Oil is a major contributor to your engine’s 
performance and longevity. If you drive the 
vehicle with insufficient or deteriorated oil, 
the engine may fail or be damaged.

This seal indicates the oil is energy conserving 
and that it meets the American Petroleum 
Institute’s latest requirements.

Use a Genuine Acura Motor Oil or another 
commercial engine oil of suitable viscosity for 
the ambient temperature as shown here.

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Synthetic oil

You may also use synthetic motor oil if it is labeled with the API Certification Seal 
and is the specified viscosity grade.

• Genuine Acura Motor Oil
• Premium-grade 0W-20 detergent oil with an API Certification Seal on the 

container.

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Recommended Engine Oil

Engine Oil Additives
Your vehicle does not require oil additives. In fact, 
they may adversely affect the engine performance 
and durability.

Ambient Temperature

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Oil Check

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Oil Check

We recommend that you check the engine oil level every time you refuel.
Park the vehicle on level ground.
Turn off the power system. You can check the oil level without the engine having 
run beforehand. If the engine has been running, wait approximately three minutes 
before you check the oil.

1. Remove the dipstick (orange).
2. Wipe the dipstick with a clean cloth or 

paper towel.

3. Insert the dipstick back all the way into its 

hole.

4. Remove the dipstick again, and check the 

level. It should be between the upper and 
lower marks. Add oil if necessary.

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Oil Check

If the oil level is near or below the lower mark, slowly 
add oil being careful not to overfill.

Upper Mark
Lower Mark

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Maintenance Under the Hood

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Adding Engine Oil

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Adding Engine Oil

1. Unscrew and remove the engine oil fill cap.
2. Add oil slowly.
3. Reinstall the engine oil fill cap, and tighten 

it securely.

4. Wait for three minutes and recheck the 

engine oil dipstick.

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Adding Engine Oil

NOTICE

Do not fill the engine oil above the upper mark. 
Overfilling the engine oil can result in leaks and 
engine damage.

If any oil spills, wipe it away immediately. Spilled oil 
may damage the engine compartment components.

Engine Oil Fill Cap

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Maintenance Under the Hood

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Changing the Engine Oil and Oil Filter

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Changing the Engine Oil and Oil Filter

You must change the engine oil and oil filter regularly in order to maintain the 
engine’s lubrication. The engine may be damaged if they are not changed regularly.

Turning the power system on automatically starts the engine if the following 
conditions are met:
• The SPORT mode is on.

2 SPORT Mode P. 395

Change the oil and filter in accordance with the maintenance message on the multi-
information display.

1. Run the engine until it reaches normal 

operating temperature, and then turn the 
engine off.

2. Open the hood and remove the engine oil 

fill cap.

3. Remove the drain bolt and washer from 

the bottom of the engine, and drain the 
oil into a suitable container.

4. Remove the oil filter and dispose of the 

remaining oil.

5. Check that the filter gasket is not stuck to 

the engine contact surface.

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If it is stuck, you must detach it.

6. Wipe away dirt and dust adhering to the 

contact surface of the engine block, and 
install a new oil filter.

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Apply a light coat of new engine oil to 
the filter gasket.

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Changing the Engine Oil and Oil Filter

NOTICE

You may damage the environment if you do not 
dispose of the oil in a suitable way. If you are 
changing the oil by yourself, appropriately dispose of 
the used oil. Put the oil in a sealed container and take 
it to a recycling center. Do not throw the oil away 
into a garbage can or onto the ground.

You will need a special wrench to replace the oil 
filter. You can buy this wrench from a dealer.

When installing the new oil filter, follow the 
instructions supplied with the oil filter.

Reinstall the engine oil fill cap. Start the engine. The 
low oil pressure indicator should go off within five 
seconds. If it does not, turn off the engine, and check 
your work.

Drain Bolt

Washer

Oil Filter

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Changing the Engine Oil and Oil Filter

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7. Put a new washer on the drain bolt, then reinstall the drain bolt.

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Tightening torque:
30 lbf∙ft (40 N∙m, 4.0 kgf∙m)

8. Pour the recommended engine oil into the engine.

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Engine oil change capacity (including filter):
4.5 US qt (4.3 L)

9. Reinstall the engine oil fill cap securely and start the engine.

10. Run the engine for a few minutes, and then check that there is no leak from the 

drain bolt or oil filter.

11. Stop the engine, wait for three minutes, and then check the oil level on the 

dipstick.

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If necessary, add more engine oil.

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Maintenance Under the Hood

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Cooling System

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Cooling System

This coolant is premixed with 50% antifreeze and 50% water. Do not add any 
straight antifreeze or water.

We recommend you check the engine coolant level every time you refuel. Check the 
reserve tank first. If it is completely empty, also check the coolant level in the 
radiator. Add the engine coolant accordingly.

1. Make sure the engine and radiator are 

cool.

2. Check the amount of coolant in the reserve 

tank.

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If the coolant level is below the MIN 
mark, add the specified coolant until it 
reaches the MAX mark.

3. Inspect the cooling system for leaks.

Specified coolant: Acura Long Life Antifreeze/Coolant Type 2

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Reserve Tank

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Cooling System

NOTICE

Genuine Acura engine coolant is a 50/50 mixture of 
antifreeze and water that can withstand freezing at 
temperatures as low as about -31°F (-35°C). If your 
vehicle is consistently subjected to temperatures 
below this, the concentration of antifreeze in the 
coolant should be increased. Consult a dealer for 
details.

If Acura antifreeze/coolant is not available, you may 
use another major brand of non-silicate coolant as a 
temporary replacement. Check that it is a high quality 
coolant recommended for aluminum engines. 
Continued use of any non-Acura coolant can result in 
corrosion, causing the cooling system to malfunction 
or fail. Have the cooling system flushed and refilled 
with Acura antifreeze/coolant as soon as possible.

Do not add rust inhibitors or other additives to your 
vehicle’s cooling system. They may not be compatible 
with the coolant or with the engine components.

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WARNING

Removing the radiator cap while the 
engine is hot can cause the coolant to spray 
out, seriously scalding you.

Always let the engine and radiator cool 
down before removing the radiator cap.

Reserve 
Tank

MAX

MIN

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Maintenance Under the Hood

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Cooling System

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1. Make sure the engine and radiator are 

cool.

2. Remove the engine compartment cover.

2 Engine Compartment Cover P. 504

3. Turn the radiator cap 1/8 turn counter-

clockwise to relieve any pressure in the 
cooling system.

4. Push down and turn the radiator cap 

counter-clockwise to remove it.

5. The coolant level should be up to the base 

of the filler neck. Add coolant if it is low.

6. Put the radiator cap back on, and tighten it 

fully.

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Radiator

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Radiator

NOTICE

Pour the fluid slowly and carefully so you do not spill 
any. Clean up any spills immediately; they can 
damage components in the engine compartment.

Radiator Cap

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Maintenance Under the Hood

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Inverter Coolant

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Inverter Coolant

This coolant is premixed with 50% antifreeze and 50% water. Do not add any 
straight antifreeze or water.

We recommend you check the inverter coolant level every time you refuel.

Have a dealer replace the inverter coolant.

1. Check the fluid level in the tank.
2. If the coolant level has dropped below the 

MIN level, have your vehicle serviced at a 
dealer.

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Only a properly trained technician can 
refill the coolant and check the system 
for leaks.

Specified coolant: Acura Long Life Antifreeze/Coolant Type 2

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Checking the Coolant

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Inverter Coolant

NOTICE

Genuine Acura engine coolant is a 50/50 mixture of 
antifreeze and water that can withstand freezing at 
temperatures as low as about -31°F (-35°C). If your 
vehicle is consistently subjected to temperatures 
below this, the concentration of antifreeze in the 
coolant should be increased. Consult a dealer for 
details.

If Acura antifreeze/coolant is not available, you may 
use another major brand of non-silicate coolant as a 
temporary replacement. Check that it is a high quality 
coolant recommended for aluminum engines.
Continued use of any non-Acura coolant can result in 
corrosion, causing the cooling system to malfunction 
or fail. Have the cooling system flushed and refilled 
with Acura antifreeze/coolant as soon as possible.

Do not add rust inhibitors or other additives to your 
vehicle’s cooling system. They may not be compatible 
with the coolant or with the motor components.

MAX

MIN

Filler 
Tank

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Maintenance Under the Hood

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Transmission Fluid

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Transmission Fluid

Have a dealer check the fluid level and replace if necessary.

Do not attempt to check or change the automatic transmission fluid yourself.

Brake Fluid

The fluid level should be between the MIN 
and MAX marks on the side of the reserve 
tank.

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Dual Clutch Transmission Fluid

Specified fluid: Acura Automatic Transmission Fluid ATF DW-1

Specified fluid: Acura Heavy Duty Brake Fluid DOT 3

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Checking the Brake Fluid

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Dual Clutch Transmission Fluid

NOTICE

Acura ATF DW-1 must not be mixed with other 
transmission fluids.
Using a transmission fluid other than Acura ATF 
DW-1 may adversely affect the operation and 
durability of your vehicle’s transmission, and damage 
the transmission.
Any damage caused by using a transmission fluid that 
is not equivalent to Acura ATF DW-1 is not covered 
by Acura’s new vehicle limited warranty.

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Brake Fluid

NOTICE

Brake fluid marked DOT 5 is not compatible with your 
vehicle’s braking system and can cause extensive 
damage.

If the specified brake fluid is not available, you should 
use only DOT 3 or DOT 4 fluid from a sealed 
container as a temporary replacement.

Using any non-Acura brake fluid can cause corrosion 
and decrease the longevity of the system. Have the 
brake system flushed and refilled with Acura Heavy 
Duty Brake Fluid DOT 3 as soon as possible.

If the brake fluid level is at or below the MIN mark, 
have a dealer inspect the vehicle for leaks or worn 
brake pads as soon as possible.

MIN

Reserve Tank

MAX

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Refilling Window Washer Fluid

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Refilling Window Washer Fluid

If the washer fluid is low, a message appears on the multi-information display.
Pour the washer fluid carefully. Do not overflow the reservoir.

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Refilling Window Washer Fluid

NOTICE

Do not use engine antifreeze or a vinegar/water 
solution in the windshield washer reservoir.
Antifreeze can damage your vehicle’s paint. A 
vinegar/water solution can damage the windshield 
washer pump.
Use only commercially available windshield washer 
fluid.
Avoid prolonged use of hard water to prevent lime 
scale build up.

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Replacing Light Bulbs

Headlights

Headlights are LED type. Have an authorized Acura dealer inspect and replace the 
light assembly.

Parking/Daytime Running Lights

Parking/daytime running lights are LED type. Have an authorized Acura dealer 
inspect and replace the light assembly.

Fog Lights

*

Fog lights are LED type. Have an authorized Acura dealer inspect and replace the 
light assembly.

Front Turn Signal Lights

Front turn signal lights are LED type. Have an authorized Acura dealer inspect and 
replace the light assembly.

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Headlights

The headlight aim is set by the factory, and does not 
need to be adjusted. However, if you regularly carry 
heavy items in the trunk, have the aiming readjusted 
at a dealer or by a qualified technician.

* Not available on all models

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Replacing Light Bulbs

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Front Side Marker Lights

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Front Side Marker Lights

Front side marker lights are LED type. Have an authorized Acura dealer inspect and 
replace the light assembly.

Side Turn Signal/Emergency Indicator Lights

Door mirror side turn lights are LED type. Have an authorized Acura dealer inspect 
and replace the light assembly.

Rear Turn Signal Lights

Rear turn signal lights are LED type. Have an authorized Acura dealer inspect and 
replace the light assembly.

Brake/Taillight and Rear Side Marker Lights

Brake/taillight and rear side marker lights are LED type. Have an authorized Acura 
dealer inspect and replace the light assembly.

Taillights

Taillights are LED type. Have an authorized Acura dealer inspect and replace the light 
assembly.

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Replacing Light Bulbs

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Back-Up Lights

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Back-Up Lights

Back-up lights are LED type. Have an authorized Acura dealer inspect and replace 
the light assembly.

Rear License Plate Lights

Rear license plate lights are LED type. Have an authorized Acura dealer inspect and 
replace the light assembly.

High-Mount Brake Light

High-mount brake light is LED type. Have an authorized Acura dealer inspect and 
replace the light assembly.

Door Outer Handle Ambient Lights

Door outer handle ambient lights are LED type. Have an authorized Acura dealer 
inspect and replace the light assembly.

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Checking and Maintaining Wiper Blades

Checking Wiper Blades

If the wiper blade rubber has deteriorated, it will leave streaks and the hard surfaces 
of the blade may scratch the window glass.

Changing the Wiper Blade Rubber

1. Set the power mode to VEHICLE OFF.
2. While holding the wiper switch in the 

MIST position, set the power mode to ON, 
then to VEHICLE OFF.

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Both wiper arms are set to the 
maintenance position as shown in the 
image.

3. Lift both wiper arms.

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Changing the Wiper Blade Rubber

NOTICE

Avoid dropping the wiper arm onto the windshield, it 
may damage the wiper arm and/or the windshield.

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Checking and Maintaining Wiper Blades

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Changing the Wiper Blade Rubber

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4. Press and hold the tab, then slide the 

holder off the wiper arm.

5. Pull the end of the wiper blade in the 

direction of the arrow in the image until it 
is out of the holder’s end cap.

6. Pull the wiper blade in the opposite 

direction to slide it out of the holder.

Tab

Wiper 
Blade

End Cap at 
the bottom

Holder

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Checking and Maintaining Wiper Blades

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Changing the Wiper Blade Rubber

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7. Insert the flat side of the new wiper blade 

onto the bottom part of the holder. Insert 
the blade all the way.

8. Install the end of the wiper blade into the 

cap.

9. Slide the holder onto the wiper arm until it 

locks.

10. Lower both wiper arms.
11. Set the power mode to ON and hold the 

wiper switch in the MIST position until 
both wiper arms return to the standard 
position.

Cap

Wiper 
Blade

Holder

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