Buick 1994 LeSabre Owner's Manual page 117

"Check Oil Level'' Light (Option)
CHECK
OIL LEVEL
The "Check Oil Level"
light is lit for three seconds
as a bulb check each time
the ignition key is turned to
the RUN position. If the
light doesn't come on, have
your vehicle serviced.
If the engine oil is more than one quart low, the light
will come on briefly, then go off for 15
-
25 seconds,
and then come back on for 20
-
40 seconds.
However, the system will not register low engine oil if it
has not been more than eight minutes since the engine
was shut off.
If the "Check Oil Level" light comes back on, the
engine oil should be checked at the dipstick then
brought up to the proper level if necessary. See "Engine
Oil" in the Index.
"Change Oil Soon'' Light (Option)
CHANGE
OIL SOON
This light is activated by
the Engine Oil Life
Monitor System. The
Engine Oil Life Monitor
determines the condition of
the engine oil and lets you
know when the oil should
be changed. See "Engine
Oil" in the Index.
It does this by electronically receiving data from the
Powertrain Control Module. The data it receives
contains information about engine speed (revolutions
per minute), coolant temperature and vehicle speed. The
Engine Oil Life Monitor uses this data to determine how
much the oil has degraded.
When to change your oil depends on driving habits and
conditions because these directly affect engine speed,
coolant temperature and vehicle speed. Because of this,
the "Change Oil Soon" light may come on as early as
2,000 miles or less for harsh circumstances.
The "Change Oil Soon" light is lit for five seconds as a
bulb check each time the ignition key is turned to the
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