I am the technical manager for Prestone.
You can use our extended life coolant safely in your Toyota after draining and flushing the old OE coolant. Our extended life coolant meets or exceeds all Toyota specifications for coolant.
If you have further questions about coolants or cooling systems, feel free to email me at Jay. Buckley@Honeywell. Com
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Tuesday, February 23rd, 2010 AT 3:42 PM