Page 422 of 524
Unscrew and remove the engine oil
fill cap on top of the valve cover.
Pour in the oil slowly and caref ully so
you do not spill any. Clean up any
spills immediately. Spilled oil could
damage components in the engine
compartment.Reinstall the engine oil f ill cap, and
tighten it securely. Wait a f ew
minutes, and recheck the oil level on
the engine oil dipstick. Do not f ill
above the upper mark; you could
damage the engine.
Oil is a major contributor to your
engine’s perf ormance and longevity.
Always use a premium-grade 5W-20
detergent oil displaying the API
Certif ication Seal. This seal indicates
the oil is energy conserving, and that
it meets the American Petroleum
Institute’s latest requirements.
CONT INUED
Recommended Engine Oil
A dding Engine Oil
Maint enance
419
ENGINE OIL FILL CAP
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2009 TSX
Page 423 of 524
Honda Motor Oil is the pref erred
5W-20 lubricant f or your vehicle. It is
highly recommended that you use
Honda Motor Oil in your vehicle f or
optimum engine protection. Make
sure the API Certif ication Seal says
‘‘For Gasoline Engines.’’Your vehicle does not require any oil
additives. Additives may adversely
af f ect the engine or transmission
perf ormance and durability.
The oil viscosity or weight is
provided on the container’s label.
5W-20 oil is f ormulated f or year-
round protection of your vehicle to
improve cold weather starting and
f uel economy.
You may use a synthetic motor oil if
it meets the same requirements
given f or a conventional motor oil: it
displays the API Certif ication Seal
and it is the proper weight. You must
f ollow the oil and f ilter change
intervals shown on the multi-
inf ormation display.
Synthetic Oil
Engine Oil A dditives
A dding Engine Oil
420
API CERTIFICATION SEAL
Ambient Temperature
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2009 TSX
Page 424 of 524

Remove the oil drain bolt and
washer from the bottom of the
engine. Drain the oil into an
appropriate container.
Always change the oil and f ilter
according to the maintenance
messages shown on the multi-
inf ormation display. The oil and f ilter
collect contaminants that can
damage your engine if they are not
removed regularly.
Changing the oil and f ilter requires
special tools and access f rom
underneath the vehicle. The vehicle
should be raised on a service station-
type hydraulic lif t f or this service.
Unless you have the knowledge and
proper equipment, you should have
this maintenance done by a skilled
technician.
Run the engine until it reaches
normal operating temperature,
then shut it off.
Open the hood and remove the
engine oil f ill cap. Remove the bolts located on the
underside of the body with a
wrench, then remove the under
cover.
2.
1. 3. 4.
CONT INUED
Changing the Engine Oil and Filter
Maint enance
421
WASHER
OIL DRAIN BOLT
BOLT UNDER COVER
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2009 TSX
Page 426 of 524

µµ
CONT INUED
If the reserve tank is completely
empty, you should also check the
coolant level in the radiator.
If the coolant level in the reserve
tank is at or below the MIN line, add
coolant to bring it up to the MAX line.
Inspect the cooling system f or leaks.
Always use Honda Long-Lif e
Antif reeze/Coolant Type 2. This
coolant is pre-mixed with 50 %
antif reeze and 50 % water. Never add
straight antif reeze or plain water.
If Honda antif reeze/coolant is not
available, you may use another
major-brand non-silicate coolant as a
temporaryreplacement.Makesureit
is a high-quality coolant
recommended f or aluminum engines.
Continued use of any non-Honda
coolant can result in corrosion,
causing the cooling system to
malf unction or f ail. Have the cooling
system f lushed and ref illed with
Honda antif reeze/coolant as soon as
possible.
A dding Engine Coolant
Engine Coolant
Maint enance
423
RESERVE TANK
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.
If you regularly drive your vehicle
under severe conditions in very low
temperature (under 31°F, 35°C), a
higher concentration of coolant should
be used. Consult your Acura dealer f or
more inf ormation of the proper coolant.
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2009 TSX
Page 428 of 524

Canadian models only
If the washer f luid is low, a
‘‘WASHER FLUID LOW’’ message
appears on the multi-inf ormation
display.
Fill the reservoir with a good-quality
windshield washer f luid. This
increases the cleaning capability and
prevents f reezing in cold weather.
When you ref ill the reservoir, clean
the edges of the windshield wiper
blades with windshield washer f luid
on a clean cloth. This will help to
condition the blade edges.Check the f luid level with the engine
at normal operating temperature.
Park the vehicle on level ground.
Start the engine, let it run until the
radiator f an comes on, then shut
of f the engine. For accurate
results, wait about 60 seconds (but
no longer than 90 seconds) bef ore
doing step 2.
1.
CONT INUED
Automatic Transmission
Windshield Washers, T ransmission Fluid
Maint enance
425
DIPSTICK
Do not use engine antif reeze or a
vinegar/water solution in the
windshield washer reservoir. Antif reeze
can damage your vehicle’s paint, while
a vinegar/water solution can damage
the windshield washer pump. Use only
commercially-available windshield
washer f luid.
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2009 TSX
Page 429 of 524

Remove the dipstick (yellow loop)
f rom the transmission, and wipe it
with a clean cloth.
Insert the dipstick all the way back
into the transmission securely as
shown in the illustration.
Remove the dipstick and check
the f luid level. It should be
between the upper and lower
marks.The transmission should be drained
andrefilledwithnewfluidwhenthis
service is shown on a maintenance
message in the multi-inf ormation
display.
If youarenotsurehowtoaddfluid,
contact your dealer.
If the level is below the lower
mark, add f luid into the dipstick
hole to bring it to the level
between the upper and lower
marks.
Pour the f luid slowly and caref ully
so you do not spill any. Clean up
any spill immediately; it could
damage components in the engine
compartment.
Always use Honda Genuine
ATF-Z1 (automatic transmission
f luid).
Insert the dipstick all the way back
into the transmission securely as
shown in the illustration.
Make sure the rubber cap on the
dipstick f its in the dipstick guide
and that you push the dipstick in
all the way.
2.
3. 5.
4. 6.
T ransmission Fluid
426
LOWER MARK
UPPER MARKGUIDE
Damage resulting f rom the use of
transmission f luid other than Honda
Genuine ATF-Z1 is not covered by the
Acura new vehicle warranty.
Using transmission f luid other than
Honda Genuine ATF-Z1 may cause
deterioration in transmission operation
and durability, and could result in
damage to the transmission.
Use only Honda Genuine ATF-Z1
(Automatic Transmission Fluid). Do
not mix with other transmission f luids.
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2009 TSX
Page 430 of 524

If Honda MTF is not available, you
may use an SAE 10W-30 or 10W-40
viscosity motor oil with the API
Certif ication seal that says ‘‘FOR
GASOLINE ENGINES’’ as a
temporary replacement. However,
motor oil does not contain the proper
additives, and continued use can
cause stiffer shifting. Replace as
soon as it is convenient.
Remove the transmission f iller bolt,
and caref ully f eel inside the bolt hole
with your f inger.
The f luid level should be up to the
edge of the bolt hole. If it is not, add
Honda Manual Transmission Fluid
(MTF) until it starts to run out of the
hole. Reinstall the f iller bolt, and
tighten it securely.
Check the f luid level with the
transmission at normal operating
temperature and the vehicle sitting
on level ground.
The transmission should be drained
andrefilledwithnewfluidwhenthis
service is shown on a maintenance
message in the multi-inf ormation
display.
If you are not sure how to check and
add f luid, contact your dealer.
To check the transmission f luid level,
remove the bolts with a wrench, then
remove the under cover caref ully. Reinstall the under cover and tighten
theboltssecurely.Makesurethe
under cover is installed under the
edge of the f ront bumper.
T ransmission Fluid
Manual Transmission
Maint enance
427
Correct level
FILLER BOLT
BOLT UNDER COVER
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2009 TSX
Page 431 of 524

Check the f luid level in the
reservoirs monthly. There are up to
two reservoirs, depending on the
model. They are:Always use Honda Heavy Duty
Brake Fluid DOT 3. If it is not
available, you should use only DOT 3
or DOT 4 f luid, f rom a sealed
container, as a temporary
replacement.
Using any non-Honda brake f luid can
cause corrosion and decrease the lif e
of the system. Have the brake
system f lushed and ref illed with
Honda Heavy Duty Brake Fluid
DOT 3 as soon as possible.
The f luid level should be between
theMINandMAXmarksontheside
of the reservoir. If the level is at or
below the MIN mark, your brake
system needs attention. Have the
brake system inspected f or leaks or
worn brake pads.
Brake f luid marked DOT 5 is not
compatible with your vehicle’s
braking system and can cause
extensive damage.
Brake f luid reservoir (all models)
Clutch f luid reservoir
(manual transmission models
only)
Replace the brake f luid when this
service is indicated on a maintenance
message in the multi-inf ormation
display.
You will also see the ‘‘BRAKE
FLUID LOW’’ message on the multi-
inf ormation display when the brake
f luid level is low. Brake Fluid
Brake and Clutch Fluid
428
MAX
MIN
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2009 TSX