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1998 Cadillac Seville S.T.S. Northstar System And Engine
"Be strong in nature; Gentle in deed."
Hi Al. The type of coolant you need to use for that model is Dex-Cool 5 year, 150,000 mile coolant/anti-freeze. Make sure you do not mix this with green coolant as it will coagulate.
Hope this info helped.
lets go forth and have fun
the coolant should be changed yearly at the beginning of the fall season. take care that the antifreese or coolant designed for aluminum engines call the cadilac dealer and see which they recomend. BETTER QUALITY THE SMARTER these engines require attention
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