Oldsmobile 1999 Aurora - Manual (Page 262)

yellow blue
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The vehicle must be on a level surface. When your
engine is cold, the coolant level should be at the FULL
COLD mark or a little higher.
If the message LOW ENGINE COOLANT is displayed
on your Driver Information Center, it means you’re low
on engine coolant.
Adding Coolant
If you need more coolant, add the proper DEX - COOL
R
coolant mixture at the surge tank, but only when the
engine is cool.