Facts About Engine Oil Consumption; Functions Of Engine Oil; Engine Oil Consumption - Toyota 2007 Tundra Owner's Manual

07 04.26
D
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.
D
If you smell exhaust fumes in the
vehicle, open the windows
close the rear window to ensure
plenty of fresh air enters the ve-
hicle. If you can smell
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.
442
D
Toyota does not recommend occu-
pying the rear cargo area when it
is fitted with a slide−in camper,
camper shell or other type cover
while the engine is running. This
caution applies to both driving and
stopped or parked situations with
and
the engine running. Particular care
should be taken to prevent exhaust
gases from entering camper bodies,
exhaust
trailers or other enclosures on or
around your vehicle.
fumes are detected, open all win-
dows and thoroughly ventilate the
area.
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.
If exhaust
D
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.
D
Oil is also used to lubricate the stems
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 TUNDRA from Jul. '07 Prod. (OM34463U)