Engine Exhaust Cautions; Engine Oil Consumption - Toyota Rav4 Operation Manual

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Engine exhaust cautions

CAUTION
"
Avoid inhaling the engine exhaust.
It contains carbon monoxide, which
is a colorless and odorless gas. It
can cause unconsciousness or even
death.
"
Make sure the exhaust system has
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 system
checked immediately.
"
Do not run the engine in a garage
or enclosed area except for the
time needed to drive the vehicle in
or out. The exhaust gases cannot
escape, making this a particularly
dangerous situation.
"
Do not remain for a long time in a
parked vehicle with the engine run-
ning. If it is unavoidable, however,
do so only in an unconfined area
and adjust the heating or cooling
system to force outside air into the
vehicle.
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"
To allow proper operation of your
vehicle's ventilation system, keep
the inlet grilles in front of the wind-
shield clear of snow, leaves, or oth-
er obstructions.
"
Hardtop: Keep the back door closed
while driving. An open or unsealed
back door may cause exhaust gases
to be drawn into the vehicle.
from
If you smell exhaust fumes in the
vehicle, drive with
open and the back door closed.
Have the cause immediately located
and corrected.
"
Soft- top: When you drive with the
soft- top closed, keep the tail gate
and rear window securely closed.
An open or unsealed tail gate and
rear window, may cause exhaust
gases to be drawn into the vehicle.
If you smell exhaust fumes in the
vehicle, drive with
open and the tail gate and rear win-
dow closed. Have the cause im-
mediately located and corrected.
'98 Rav4.U
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.
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Oil is used to lubricate pistons, piston
rings and cylinders. A thin film of oil
is left on the cylinder wall when a pis-
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.
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