Engine Exhaust Cautions; Facts About Engine Oil Consumption - Toyota 2007 Highlander Owner's Manual

Engine exhaust cautions

CAUTION
Avoid inhaling the engine exhaust.
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It contains carbon monoxide, which
is a colorless and odorless gas. It
can cause unconsciousness or even
death.
Make sure the exhaust system has
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no holes or loose connections. The
system should be checked
time to time. If you hit something,
or notice a change in the sound of
the exhaust, have the
checked immediately.
Do not run the hybrid system in a
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garage or other enclosed areas ex-
cept to drive the vehicle in or out.
In enclosed areas, exhaust gases
cannot escape, making this a partic-
ularly dangerous situation.
Do not remain for a long time in a
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parked vehicle with the hybrid sys-
tem on. If it is unavoidable, howev-
er, make sure to park the vehicle in
an unclosed area and adjust the
heating or cooling system to force
outside air into the vehicle.
Keep the back door closed while
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driving. An open or unsealed back
door may cause exhaust gases to
be drawn into the vehicle.
To allow proper operation of your
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vehicle's ventilation system, keep
the inlet grilles in front of the wind-
shield clear of snow, leaves, or oth-
er obstructions.
from
If you smell exhaust fumes in the
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vehicle, open the
close the back
system
plenty of fresh air enters the ve-
hicle. If you can
fumes even though there are no
other vehicles in the surrounding
area, have your vehicle checked by
your Toyota dealer. Continued in-
halation of exhaust fumes can lead
to death by gas poisoning.
'07 HIGHLANDER HV_U (L/O 0608)
Facts about engine oil
consumption
FUNCTIONS OF ENGINE OIL
Engine oil has the primary functions of
lubricating and cooling the inside of the
engine, and plays a major role in main-
taining the engine in proper working order.
ENGINE OIL CONSUMPTION
It is normal that an engine should con-
sume some engine oil during normal
engine operation. The causes of oil
consumption in a normal engine are as
follows.
windows and
Oil is used to lubricate pistons, piston
door to ensure
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rings and cylinders. A thin film of oil
is left on the cylinder wall when a pis-
smell exhaust
ton moves downwards in the cylinder.
High negative pressure generated when
the vehicle is decelerating sucks some
of this oil into the combustion chamber.
This oil as well as some part of the oil
film left on the cylinder wall is burned
by the high temperature combustion
gases during the combustion process.
Oil is also used to lubricate the stems
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of the intake valves. Some of this oil
is sucked into the combustion chamber
together with the intake air and is
burned along with the fuel. High tem-
perature exhaust gases also burn the
oil used to lubricate the exhaust valve
stems.
2007 HIGHLANDER HV from July '06 Prod. (OM48685U)
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