2018 MAZDA MODEL 3 HATCHBACK coolant reservoir

Engine Compartment Overview
Windshield washer fluid reservoirBrake/Clutch fluid reservoir
Engine oil dipstick Battery
Fuse block
Cooling system cap Engine coolant reservoir Engine oil-filler cap
Maintenance and Care
Owner Maintenance
6-22
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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
WA R N I N G
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.
Maintenance and Care
Owner Maintenance
6-25
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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 reserv oir is empty or new
coolant is required frequently, consult an
Authorized Mazda Dealer.
Maintenance and Care
Owner Maintenance
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If you find a leak or other damage, or if
coolant is still leaking:
Stop the engine and call an Authorized
Mazda Dealer.
Cooling system cap
Coolant reservoir
Cooling fan
If you find no problems, the engine is
cool, and no leaks are obvious:
Carefully add coolant as required (page
6-25).
CAUTION
If the engine continues to overheat or
frequently overheats, have the cooling
system inspected. The engine could be
seriously damaged unless repairs are
made. Consult an Authorized Mazda
Dealer.
If Trouble Arises
Overheating
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▼Capacities
(Approximate Quantities)
Item
Capacity
Engine oil SKYACTIV-G
2.0
With oil filter replacement
4.2 L (4.4 US qt, 3.7 Imp qt)
Without oil filter replacement 4.0 L (4.2 US qt, 3.5 Imp qt)
SKYACTIV-G
2.5 With oil filter replacement
4.5 L (4.8 US qt, 4.0 Imp qt)
Without oil filter replacement 4.3 L (4.5 US qt, 3.8 Imp qt)
Coolant SKYACTIV-G
2.0
For vehicle identi-
fication number
beginning with
JM1
*1
Manual transaxle 6.3 L (6.7 US qt, 5.5 Imp qt)
Automatic transaxle 6.5 L (6.9 US qt, 5.7 Imp qt)
For vehicle identi-
fication number
beginning with
3MZ
*1
Manual transaxle 6.2 L (6.6 US qt, 5.5 Imp qt)
Automatic transaxle 6.5 L (6.9 US qt, 5.7 Imp qt)
SKYACTIV-G
2.5 For vehicle identi-
fication number
beginning with
JM1
*1
Manual transaxle 6.5 L (6.9 US qt, 5.7 Imp qt)
Automatic transaxle
(U.S.A. and Canada)
6.8 L (7.2 US qt, 6.0 Imp qt)/ (Mexico)
6.7 L (7.1 US qt, 5.9 Imp qt)
For vehicle identi-
fication number
beginning with
3MZ
*1
Manual transaxle 6.5 L (6.9 US qt, 5.7 Imp qt)
Automatic transaxle 6.7 L (7.1 US qt, 5.9 Imp qt)
Manual transaxle oil SKYACTIV-G 2.0 1.70 L (1.80 US qt, 1.50 Imp qt)
SKYACTIV-G 2.5 1.65 L (1.74 US qt, 1.45 Imp qt)
Automatic transaxle fluid 7.8 L (8.2 US qt, 6.9 Imp qt)
Fuel tank U.S.A. and Canada 50.0 L (13.2 US gal, 11.0 Imp gal)
Mexico 51.0 L (13.5 US gal, 11.2 Imp gal)
Check oil and fluid levels with d
ipsticks or reservoir gauges.*1 Check the vehicle identificati on number on the vehicle identification number plate. Refer to Vehicle
Identification Number on page 9-2.
Specifications
Specifications
9-5
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