Oldsmobile cutlass supreme 1996 Owner's Manual page 242

NOTICE:
If you use.an improper coolant
mix, your engine-
could overheat and be badly damaged. The
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repair cost wouldn't be covered by your
warranty. Too much water in the mix can freeze
and crack' the engine, radiator, heater core and
other parts.
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If you have to add coolant more than four times a year,
,have your retailer check your cooling system.
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NOTICE:
If you use the proper coolant, you don't have to
add extra inhibitors or additives which claim to
improve the system. These can be harmful.
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Chec'-'ng Coolant
When your engine is cold, the coolant level should be at
the COLD mark or a little higher. When your engine. is
warm, the level should be up' to the HOT mark or, a
little higher.
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