BYD G3 AUTO Owner’s Manual
81
Consumption of Engine Oil
Function of Engine Oil
Engine oil is used to lubricate and cool
the inside of the engine and play a major
role in maintenance to keep the engine
at normal running status.
Consumption of Engine Oil
The engine consumes some engine
oil in normal running status for the
following causes:
●
Piston, piston ring and cylinders are
lubricated by engine oil. When a
piston moves downwards in a cylinder,
a film of engine oil will be formed on
the cylinder wall. In deceleration, the
resulting high negative pressure will
suck in engine oil from the film to the
combustion chamber. The sucked-in
engine oil will combust together with
the oil film on the cylinder wall during
the high-temperature combustion in
the chamber.
●
The intake valve stem is also
lubricated by engine oil. Some engine
oil is sucked in together with the
intake air to the combustion chamber
and participates in combustion. High
temperature exhaust gas may also
combust engine oil used to lubricate
the exhaust valve stem.
Consumption speed of engine oil
depends on its viscosity and quality and
actual vehicle conditions.
High speed driving and frequent
acceleration/ deceleration will increase
consumption of engine oil.
New engine may consume more engine
oil as the pistons, piston rings and
cylinder walls shall undergo running-in.
Consumption of Engine Oil
Pay close attention that the engine oil
consumption may not be judged
correctly by engine oil level because
the engine oil may be diluted.
For example, after the car has
undergone repeated short trips (such as
1,000 km), the engine oil level on
dipstick may have not dropped even
when engine oil is consumed normally.
The fact that the engine oil has been
diluted by fuel and steam make the oil
level stay at the original position on the
dipstick.
During high-speed driving, such as a trip
on express way, the foreign matter may
be evaporated. As a result, the engine
oil level may drop sharply after a
high-speed trip.
Significance of Checking Engine Oil
Level
One of the key points in vehicle
maintenance is to keep the engine oil at
optimum level, which allows normal
function of the engine oil. In one word, it
is important to check the engine oil level
regularly. You are recommended to
check the engine oil level every time you
refill gasoline.
Note
If the engine oil level is not
checked regularly, insufficient
engine oil may result in severe
engine faults.
For details on checking engine oil level,
please refers to “
Check Engine Oil
Level
” in Section 7-2.
