Mazda 3 Hatchback (2018 year). Manual - part 28

Engine Oil

NOTE
Changing the engine oil should be
performed by an Authorized Mazda
Dealer.
Refer to Introduction (page 6-2) for
owner's responsibility in protecting your
investment.

▼ Recommended Oil

U.S.A., Canada, and Puerto Rico

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 Mazda Genuine Parts and
Castrol

(U.S.A. only).

(ILSAC)

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), comprised of U.S.
and Japanese automobile manufacturers.

–40 –20

100

–10

–20

–30

–40

Except U.S.A., Canada, and Puerto Rico

Use SAE 5W-30 engine oil.
Oil container labels provide important
information.
A chief contribution this type of oil makes
to fuel economy is reducing the amount of
fuel necessary to overcome engine
friction.

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For maintenance service, Mazda
recommends Mazda Genuine Parts and
Castrol

(Mexico only).

(ILSAC)

(Mexico)
Use SAE 5W-30 engine oil. If SAE 5W-30
engine oil is not available, use SAE 5W-20
engine oil.

The quality designation SM, or ILSAC
must be on the label.

–40 –20

100

–10

–20

–30

–40

▼ Vehicle Engine Control Unit Reset

Procedure

After replacing the engine oil, it is
recommended to have a repair shop such
as an Authorized Mazda Dealer perform
the initialization (engine oil data resetting)
of the recorded value. If the value
recorded by the computer is not initialized,
the wrench indicator light may not turn off
or it may turn on earlier than normal.
Refer to Maintenance Monitor on page
6-16.

▼ Inspecting Engine Oil Level

1. Be sure the vehicle is on a level

surface.

2. Warm up the engine to normal

operating temperature.

3. Turn it off and wait at least 5 minutes

for the oil to return to the oil pan.

4. Pull out the dipstick, wipe it clean, and

reinsert it fully.

MAX

MIN

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5. Pull it out again and examine the level.

The level is normal if it is between the
MIN and MAX marks.
If it is near or below MIN, add enough
oil to bring the level to MAX.

CAUTION

Do not overfill the engine oil. This may
cause engine damage.

6. Make sure the O-ring on the dipstick is

positioned properly before reinserting
the dipstick.

7. Reinsert the dipstick fully.

Engine Coolant

▼ Inspecting Coolant Level

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 ignition 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.

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NOTE
Changing the coolant should be done by
an Authorized Mazda Dealer.

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.

The coolant should be at full in the
radiator and between the F and L marks on
the coolant reservoir when the engine is
cool.

If it is at or near L, add enough coolant to
the coolant reservoir to provide freezing
and corrosion protection and to bring the
level to F.
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.

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Brake/Clutch Fluid

▼ Inspecting Brake/Clutch Fluid Level

WARNING

If the brake/clutch fluid level is low, have
the brakes inspected:
A low brake/clutch 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.

The brakes and clutch draw fluid from the
same reservoir.
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 and clutch
linings. If it is excessively low, have the
brake/clutch system inspected by an
Authorized Mazda Dealer.

Washer Fluid

▼ Inspecting Washer Fluid Level

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 degrees C (40 degrees 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.

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.

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Inspect fluid level in the washer fluid
reservoir; add fluid if necessary.

Use plain water if washer fluid is
unavailable.
But use only washer fluid in cold weather
to prevent it from freezing.

NOTE
Front and rear washer fluid is supplied
from the same reservoir.

Body Lubrication

All moving points of the body, such as
door and hood hinges and locks, should be
lubricated each time the engine oil is
changed. Use a nonfreezing lubricant on
locks during cold weather.

Make sure the hood's secondary latch
keeps the hood from opening when the
primary latch is released.

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Wiper Blades

CAUTION

Hot waxes applied by automatic car

washers have been known to affect the
wiper's ability to clean windows.

To prevent damage to the wiper blades,

do not use gasoline, kerosene, paint
thinner, or other solvents on or near
them.

When the wiper lever is in the AUTO

position and the ignition is switched ON,
the wipers may move automatically in
the following cases:

If the windshield above the rain sensor

is touched.

If the windshield above the rain sensor

is wiped with a cloth.

If the windshield is struck with a hand

or other object.

If the rain sensor is struck with a hand

or other object from inside the vehicle.

Be careful not to pinch hands or fingers
as it may cause injury, or damage the
wipers. When washing or servicing the
vehicle, make sure the wiper lever is in
the OFF position.

Contamination of either the windshield or
the blades with foreign matter can reduce
wiper effectiveness. Common sources are
insects, tree sap, and hot wax treatments
used by some commercial car washes.

If the blades are not wiping properly, clean
the window and blades with a good
cleaner or mild detergent; then rinse
thoroughly with clean water. Repeat if
necessary.

▼ Replacing Windshield Wiper Blades

When the wipers no longer clean well, the
blades are probably worn or cracked.
Replace them.

CAUTION

To prevent damage to the wiper arms and
other components, do not try to sweep the
wiper arm by hand.

NOTE
When raising both windshield wiper arms,
raise the driver's side wiper arm first.
When lowering the wiper arms, slowly
lower the wiper arm from the passenger's
side first while supporting it with your
hand. Forcefully lowering the wiper arms
could damage the wiper arm and blade,
and may scratch or crack the windshield.

1. Raise the wiper arm.
2. Open the clip and slide the blade

assembly in the direction of the arrow.

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3. Tilt the blade assembly and remove it

from the arm.

CAUTION

To prevent damage to the windshield
let the wiper arm down easily, do not let
it slap down on the windshield.

4. Pull down the blade rubber and slide it

out of blade holder.

5. Remove the metal stiffeners from each

blade rubber and install them in the
new blade.

CAUTION

Do not bend or discard the stiffeners.

You need to use them again.

If the metal stiffeners are switched,

the blade's wiping efficiency could be
reduced.
So do not use the driver's side metal
stiffeners on the passenger's side, or
vice versa.

Be sure to reinstall the metal

stiffeners in the new blade rubber so
that the curve is the same as it was in
the old blade rubber.

6. Carefully insert the new blade rubber.

Then install the blade assembly in the
reverse order of removal.

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▼ Replacing Rear Window Wiper

Blade (5-Door)

When the wiper no longer cleans well, the
blade is probably worn or cracked.
Replace it.

CAUTION

To prevent damage to the wiper arm and
other components, do not move the wiper
by hand.

1. Remove the cover.

2. (With stopper type)

Remove the stopper and raise the
wiper arm.
(Without stopper type)
Raise the wiper arm.

Stopper

3. Firmly rotate the wiper blade to the

right until it unlocks, then remove the
blade.

CAUTION

To prevent damage to the rear window,
do not let the wiper arm fall on it.

4. Pull down the blade rubber and slide it

out of the blade holder.

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5. Remove the metal stiffeners from the

blade rubber and install them in the
new blade.

CAUTION

Do not bend or discard the stiffeners.
You need to use them again.

6. Carefully insert the new blade rubber.

Then install the blade assembly in the
reverse order of removal.

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Battery

WARNING

Wash hands after handling the battery and related accessories:
Battery posts, terminals and related accessories contain lead and lead compounds, chemicals
known to the State of California to cause cancer and reproductive harm.

Read the following precautions carefully before using the battery or inspecting to

ensure safe and correct handling:

Always wear eye protection when working near the battery:

Working without eye protection is dangerous. Battery fluid contains SULFURIC ACID which
could cause blindness if splashed into your eyes. Also, hydrogen gas produced during normal
battery operation, could ignite and cause the battery to explode.

Wear eye protection and protective gloves to prevent contact with battery fluid:

Spilled battery fluid is dangerous.
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.

Always keep batteries out of the reach of children:

Allowing children to play near batteries is dangerous. Battery fluid could cause serious injuries
if it gets in the eyes or on the skin.

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Keep flames and sparks away from open battery cells and do not allow metal tools to

contact the positive ( ) or negative ( ) terminal of the battery when working near a battery.
Do not allow the positive ( ) terminal to contact the vehicle body:
Flames and sparks near open battery cells are dangerous. Hydrogen gas, produced during
normal battery operation, could ignite and cause the battery to explode. An exploding battery
can cause serious burns and injuries. Keep all flames including cigarettes and sparks away
from open battery cells.

Keep all flames, including cigarettes, and sparks away from open battery cells:

Flames and sparks near open battery cells are dangerous. Hydrogen gas, produced during
normal battery operation, could ignite and cause the battery to explode. An exploding battery
can cause serious burns and injuries.

NOTE
Before performing battery maintenance, remove the battery cover.

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▼ Battery Maintenance

To get the best service from a battery:



Keep it securely mounted.



Keep the top clean and dry.



Keep terminals and connections clean,
tight, and coated with petroleum jelly or
terminal grease.



Rinse off spilled electrolyte immediately
with a solution of water and baking
soda.



If the vehicle will not be used for an
extended time, disconnect the battery
cables and charge the battery every six
weeks.

▼ Battery Replacement

Contact an Authorized Mazda Dealer for a
battery replacement purchase.

Key Battery Replacement

If the buttons on the transmitter are
inoperable and the operation indicator
light does not flash, the battery may be
dead.
Replace with a new battery before the
transmitter becomes unusable.

CAUTION

Make sure the battery is installed

correctly. Battery leakage could occur if it
is not installed correctly.

When replacing the battery, be careful

not to touch any of the internal circuitry
and electrical terminals, bend the
electrical terminals, or get dirt in the
transmitter as the transmitter could be
damaged.

There is the danger of explosion if the

battery is not correctly replaced.

Dispose of used batteries according to

the following instructions.

Insulate the plus and minus terminals

of the battery using cellophane or
equivalent tape.

Never disassemble.
Never throw the battery into fire or

water.

Never deform or crush.

Replace only with the same type battery

(CR2025 or equivalent).

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The following conditions indicate that the
battery power is low:



The KEY indicator light (green) flashes
in the instrument cluster for about 30
seconds after the engine is turned off.



The system does not operate and the
operation indicator light on the
transmitter does not flash when the
buttons are pressed.



The system's operational range is
reduced.

Replacing the battery at an Authorized
Mazda Dealer is recommended to prevent
damage to the key. If replacing the battery
by yourself, follow the instruction.

Replacing the key battery

1. Press the knob and pull out the

auxiliary key.

Knob

2. Twist a tape-wrapped flathead

screwdriver in the direction of the
arrow and open the cover slightly.

Cover

3. Insert the tape-wrapped flathead

screwdriver into the gap and slide it in
the direction of the arrow.

Cover

Gap

4. Twist the flathead screwdriver in the

direction of the arrow and remove the
cover.

Cover

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5. Remove the battery cap, then remove

the battery.

CAUTION

Be careful not to allow the rubber

ring shown in the figure to be
scratched or damaged.

If the rubber ring detaches, reattach

it before inserting a new battery.

Rubber ring

6. Insert a new battery with the positive

pole facing up, and then cover the
battery with the battery cap.

7. Close the cover.

8. Reinsert the auxiliary key.

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Tires

For reasons of proper performance, safety,
and better fuel economy, always maintain
recommended tire inflation pressures and
stay within the recommended load limits
and weight distribution.

WARNING

Using Different Tire Types:
Driving your vehicle with different types of
tires is dangerous. It could cause poor
handling and poor braking; leading to loss
of control.
Except for the limited use of the temporary
spare tire, use only the same type tires
(radial, bias-belted, bias-type) on all four
wheels.

Using Wrong-Sized Tires:
Using any other tire size than what is
specified for the vehicle (page 9-10) is
dangerous. It could seriously affect ride,
handling, ground clearance, tire clearance,
and speedometer calibration. This could
cause you to have an accident. Use only
tires that are the correct size specified for
the vehicle.

▼ Tire Inflation Pressure

WARNING

Always inflate the tires to the correct
pressure:
Overinflation or underinflation of tires is
dangerous. Adverse handling or
unexpected tire failure could result in a
serious accident.
Refer to Tires on page 9-10.

Use only a Mazda-genuine tire valve cap:
Use of a non-genuine part is dangerous as
the correct tire air pressure cannot be
maintained if the tire valve becomes
damaged. If the vehicle is driven under this
condition, the tire air pressure will decrease
which could result in a serious accident. Do
not use any part for the tire valve cap that
is not a Mazda-genuine part.

Inspect all tire pressures monthly
(including the spare) when the tires are
cold. Maintain recommended pressures for
the best ride, handling, and minimum tire
wear.
Refer to the specification charts (page 9-
10).
(With tire pressure monitoring system)
After adjusting the tire pressure,
initialization of the tire pressure
monitoring system is necessary to make
the system operate normally.
Refer to Tire Pressure Monitoring System
Initialization on page 4-148.

NOTE



Always check tire pressure when tires
are cold.



Warm tires normally exceed
recommended pressures. Do not release
air from warm tires to adjust the
pressure.



Underinflation can cause reduced fuel
economy, uneven and accelerated tire
wear, and poor sealing of the tire bead,
which will deform the wheel and cause
separation of tire from rim.

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