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Discussion Starter · #1 ·
What causes head gasket failure in the Previa? If it's overheating, is it possible to prevent or delay the problem through cooling system maintenance?

Or is the problem caused by the different expansion rates of the iron block and aluminum head... which means it's only a matter of time and heating/cooling cycles. If this is the case, does it tend to fail around a certain mileage?

I recently purchased a 1994 SC/All Trac and am trying to figure what I should do to help it last and stay reliable. :)
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