Buick 1994 Roadmaster Owner's Manual page 125

Low Oil Level Light
LOW
0 1. L
LEV
The "Low Oil Level" light
should come on briefly
while you are starting your
engine. If the light doesn't
come on, have your vehicle
serviced, so it will be ready
to warn you if there's a
problem..
When the "LOW OIL LEV" light comes on you should
check your engine oil level and fill if necessary. See
Engine Oil in the Index.
If the light stays on, your engine oil level should be
checked. Check your oil level (be sure your vehicle is on
a level surface), and bring the engine oil up to the proper
level, if necessary. See "Engine Oil" in the Index.
Change Oil Indicator
The "Change Oil" light is activated by the Engine Oil
Life Monitor System. The engine oil life monitor system
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
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" light many come on as early as 2,000
miles or less for harsh conditions.
If the "Change Oil" light is on continuously, change the
oil.
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