Engine - BYD M6 Owner's Manual

Engine

Engine Oil Consumption
Engine oil function
The primary function of the engine oil
is to lubricate and cool moving parts
of the engine, so as to keep the
engine running normally.
Engine Oil Consumption
Oil consumption is expected in all
engines. Under normal conditions, oil
consumption can be attributed to the
following reasons:
Engine oil is used to lubricate the
cylinder, piston and position ring.
When the piston moves downward
in the cylinder, a thin oil film will
form on the cylinder wall. When
the vehicle is decelerating, high
negative pressure generated in the
engine will suck some oil into the
combustion chamber. This oil as
well as part of the oil film left on the
Part Maintenance 7-6
BYD M6 AUTO Owner's Manual
cylinder wall is burned during the
high temperature combustion
process.
Engine oil is also used to lubricate
the intake valve stems. Some of
this oil is sucked
combustion chamber together with
the intake air and is burned along
with the fuel. High temperature
exhaust gases also burn the oil
used to lubricate the exhaust valve
stems.
The amount of engine oil consumed
depends on the viscosity and quality
of the oil and the conditions under
which you are driving.
Oil consumption will be more during
high speed driving and frequent
acceleration and deceleration.
A new engine consumes more oil, and
proper running-in process
necessary to seat the mating surface
of the pistons, piston rings and
cylinder walls.
When judging the amount of oil
consumption, note that the oil may
become diluted and make it difficult to
judge the true level accurately.
For example, if a vehicle is used for
into the
repeated short trips, and consumes a
normal amount of oil, the dipstick may
not show any drop in oil level at all,
even after 1000km or more.
This is because the oil is gradually
diluted by fuel or moisture, making it
appears that the oil level has not
changed.
The diluting ingredients will evaporate
in high speed driving, such as on an
expressway. That is why sometimes
you will find out the oil is excessively
consumed after driving at high speed.
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