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Is the top and bottom of the radiator plastic? If so, this is usually a sign of an OEM type radiator with aluminum core. The article below explains coolants, what to use with an aluminum or cooper radiator.

Suggest finding a coolant without silicates or borates. Toyota is free of these additives and the longer life coolants should also be. Just read the container to find out. Prestone has a long life fluid.

http://www.popularmechanics.com/how_to_central/automotive/1272436.html
 
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