Buick 1993 Roadmaster Owner's Manual page 262

How To Check Power Steering Fluid:
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Unscrew the cap and wipe the dipstick with a clean rag.
Replace the cap and completely tighten it. Then remove
the cap again and look at the fluid level on the dipstick.
When the engine compartment is hot, the level
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should be at the "HOT" mark. *.
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When the engine Compartment is cool, the level
should be at the "FULL COLD'; mark.
What to Add:
Refer to the Maintenance Schedule to determine what
kind of fluid to use. See ('Recommended Fluids and
Lubricants" in the Index.
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