BYD L3 AUTO, Owner'S Manual

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BYD L3
AUTO Owner’s Manual
Tips on Driving BYD L3 2-5
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.