2024 MAZDA CX90 engine

Closing the engine cover
1.
2. Pinch the strap and press it in until a click sound is heard, and store.
3.
Inspection and Servicing/Cleaning
Engine Compartment Inspection
9-11
CX-90_8KG7-EA-22L_Edition1_new2022-11-17 16:05:04

4.
5. Make sure that the engine cover is securely closed.
Inspection and Servicing/Cleaning
Engine Compartment Inspection
9-12
CX-90_8KG7-EA-22L_Edition1_new2022-11-17 16:05:04

Inspecting Engine Oil
CAUTION
Do not overfill the engine oil. This may
cause engine damage.

Use center display screen indication to
inspect the engine oil level.
1. Make sure the hood is closed.
2. Start the hybrid system.
3. Select “Information” on the Home screen to display the vehicle status
monitor.
4. Select “Vehicle Status Monitor”.
5. Select “Engine Oil Level”.
6. Select “Start”. The engine starts and measurement
of the engine oil level begins. Do
not depress the accelerator pedal
during the measurement.
NOTE
If measurement conditions not
shown on the display are not met
such as when warm-up operation
has not been completed due to low
outdoor temperatures, the
measurement error screen may be
displayed. In this case, drive the
vehicle using the engine for a
certain period of time to complete
the warm-up operation and repeat
the procedure.

7. Switch the vehicle power OFF.
NOTE
After the measurement is
completed, the engine does not
stop automatically.

Recommended Oil
Use SAE 0W-20 engine oil.
Mazda Genuine Oil is used in your
Mazda vehicle. Mazda Genuine
0W-20 Oil is required to achieve
optimum fuel economy.
For maintenance service, Mazda
recommends Genuine Mazda Parts
and Genuine Mazda Premium Oil.

Only use SAE 0W-20 oil “Certified For
Gasoline Engines” by the American
Petroleum Institute (API).
Oil with this trademark symbol
conforms to the current engine and
emission system protection standards
and fuel economy requirements of the
International Lubricant Standardization
and Approval Committee (ILSAC),
Inspection and Servicing/Cleaning
Engine Compartment Inspection
9-13
CX-90_8KG7-EA-22L_Edition1_new 2022-11-17 16:05:04

comprised of U.S. and Japanese
automobile manufacturers.
Inspecting the Coolant
WARNING
Do not use a match or live flame in
the engine compartment. DO NOT
ADD COOLANT WHEN THE ENGINE
IS HOT.
A hot engine is dangerous. If the
engine has been running, parts of the
engine compartment can become very
hot. You could be burned. Carefully
inspect the engine coolant in the
coolant reservoir, but do not open it.
Pull over to a safe location, then
switch the vehicle power off and
make sure the fan is not running
before attempting to work near the
cooling fan.
Working near the cooling fan when it is
running is dangerous. The fan could
continue running indefinitely even if
the engine has stopped and the engine
compartment temperature is high. You
could be hit by the fan and seriously
injured.
Do not remove either
cooling system cap when the engine
and radiator are hot.
When the engine and radiator are hot,
scalding coolant and steam may shoot
out under pressure and cause serious
injury.
NOTE
Changing the coolant should be done
by an Authorized Mazda Dealer.
Inspection and Servicing/Cleaning
Engine Compartment Inspection
9-14
CX-90_8KG7-EA-22L_Edition1_new 2022-11-17 16:05:04

Inspect the antifreeze protection and
coolant level in the coolant reservoir at
least once a year―at the beginning of
the winter season ―and before
traveling where temperatures may drop
below freezing.

Inspect the condition and connections
of all cooling system and heater hoses.
Replace any that are swollen or
deteriorated.

There are two cooling circuits: one for
the automatic transmission, and the
other for the engine. Check both
circuits.
The coolant should be at full in the
radiator and between the F and L
marks, and between the FULL and
LOW marks on the coolant reservoir
when the engine is cool.
There are two coolant reservoir tanks.
Check each of them.
1. The tank for the EV system
2. The tank for the engine

If it is at or near the LOW position, add
enough coolant to the coolant
reservoir to provide freezing and
corrosion protection and to bring the
level to FULL.
Securely tighten the coolant reservoir
tank cap after adding coolant.
CAUTION
 Radiator coolant will damage paint.
Rinse it off quickly if spilled.
 If the “FL22” mark is shown on or
near the cooling system cap, use of
FL-22 is recommended when
replacing engine coolant. Using
engine coolant other than FL-22 may
cause serious damage to the engine
and cooling system.

If the coolant reservoir is empty or new
coolant is required frequently, consult
an Authorized Mazda Dealer.
Inspection and Servicing/Cleaning
Engine Compartment Inspection
9-15
CX-90_8KG7-EA-22L_Edition1_new 2022-11-17 16:05:04

Inspecting the Brake Fluid
WARNING
If the brake fluid level is low, have the
brakes inspected.
A low brake fluid level is dangerous. A
low level could indicate brake lining
wear or a brake system leak which
could cause the brakes to fail and lead
to an accident.
Inspect the fluid level in the reservoir
regularly. It should be kept between
the MAX and MIN lines.
The level normally drops with
accumulated distance, a condition
associated with wear of brake linings. If
it is excessively low, have the brake
system inspected by an Authorized
Mazda Dealer.

Before inspecting the brake fluid,
remove the hole cover.
Removing the Hole Cover.
1.
2.
3.

Installing the Hole Cover.
1. Insert the hole cover into the cowlgrille.
Make sure that the hole cover holds
the cowl grille and the knobs are in
the correct position.
1. The hole cover
2. The cowl grille
2.

Inspection and Servicing/Cleaning
Engine Compartment Inspection
9-16
CX-90_8KG7-EA-22L_Edition1_new 2022-11-17 16:05:04

Brake fluid reservoirReplenishing WindshieldWasher Fluid
WARNING
Use only windshield washer fluid or
plain water in the reservoir.
Using radiator antifreeze as washer
fluid is dangerous. If sprayed on the
windshield, it will dirty the windshield,
affect your visibility, and could result in
an accident.
Using Washer Fluid Without
Anti-freeze Protection in Cold
Weather:
Operating your vehicle in temperatures
below 4 ℃ (40 °F) using washer fluid
without anti-freeze protection is
dangerous as it could cause impaired
windshield vision and result in an
accident. In cold weather, always use
washer fluid with anti-freeze
protection.
CAUTION
Do not use soapy water or engine
antifreeze in the reservoir as it could
cause paint discoloration or pump
damage.
NOTE
State or local regulations may restrict
the use of volatile organic
compounds (VOCs), which are
commonly used as anti-freeze agents
in washer fluid. A washer fluid with
limited VOC content should be used
only if it provides adequate freeze
resistance for all regions and climates
in which the vehicle will be
operated.
Inspection and Servicing/Cleaning
Engine Compartment Inspection
9-17
CX-90_8KG7-EA-22L_Edition1_new 2022-11-17 16:05:04

Replenish the washer fluid on a flat
surface. If the vehicle is tilted, washerfluid may not fill sufficiently.
Add washer fluid under any of the
following conditions.
The top of the fluid level is low.The Low Washer Fluid Level Warning
Indication/Warning Light (if
equipped) turns on.
The top of the fluid level is lower
than L (if equipped).

Use plain water if washer fluid is
unavailable.
But use only washer fluid in cold
weather to prevent it from freezing.
Inspecting Lead-acid
Battery
WARNING
Read the following
precautions carefully before using the
lead-acid battery or inspecting to
ensure safe and correct handling.
Always wear eye
protection when working near the
lead-acid battery.
Working without eye protection is
dangerous. Lead-acid battery fluid
contains SULFURIC ACID which could
cause blindness if splashed into your
eyes. Also, hydrogen gas produced
during normal lead-acid battery
operation, could ignite and cause the
lead-acid battery to explode.
Wear eye protection
and protective gloves to prevent
contact with lead-acid battery fluid.
Spilled lead-acid battery fluid is
dangerous.
Lead-acid battery fluid contains
SULFURIC ACID which could cause
serious injuries if it gets in eyes, or on
the skin or clothing. If this happens,
immediately flush your eyes with water
for 15 minutes or wash your skin
thoroughly and get medical attention.
Inspection and Servicing/Cleaning
Engine Compartment Inspection
9-18
CX-90_8KG7-EA-22L_Edition1_new 2022-11-17 16:05:04