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Any type of antifreeze will work in a 99 Saturn SL1. Many people recommend using Prestone Antifreeze for cars that are older than ten years.
134a.
A 1997 Jeep uses the regular green antifreeze.
Dex-cool
Dexcool don't use any other type
Green
Dexcool
Match the color of your antifreeze to the new one you buy unless it states its good for all types.
regular green antifreeze
The 1999 Saturn engine uses dexcool type coolant. This coolant is different form other types and cannot me mixed with another type.
Green
Plain green.