Here's a quote from Prestone's site...
Quote:
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For those consumers who would feel more comfortable using a phosphate-free antifreeze, our Prestone® Extended Life 5/150 Antifreeze/Coolant is phosphate, silicate, and borate free. This coolant uses a special chemistry and technology that extends the life of the corrosion inhibitor package so that it lasts for five years or 150,000 miles (whichever comes first), and is safe for all cars and light trucks (old or new).
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Not sure how it compares to the Honda stuff, but it's silicate and borate free. I've had it in since June. How does Honda get away with stating that you MUST use their products for warranty repairs?