Buick RIVIERA 1993 Manual page 111

When the "LOW OIL LEVEL" light comes on you
should check your engine oil level and fill if necessary.
See Engine Oil in the Index.
There are three ways the LOW light can come on
briefly. Those three are normal and don't show a
problem. These three ways are:
1.
2.
3.
could be low on oil, or you might have some other
oil problem.
CAUTION:
Don't keep driving if the oil pressure is low. If
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