bill pritchett Posted December 13, 2006 Share Posted December 13, 2006 Prestone now has fully synthetic brakes fluids out now. I saw them in Walmart and had my mechanic use 3 in my 61 Olds as I had to do the master cylinder. It feels the same and Prestone said 3, at least, is fully compatible with normal DOT 3 brake fluid.Has anyone used the new fluids yet? Link to comment Share on other sites More sharing options...
Ron Green Posted December 13, 2006 Share Posted December 13, 2006 Bill,I just spoke to Prestone (now owned by Honeywell) technical as I have been thinking about making the switch on the old vehicles. Here is what they said; Dot 3, 4 & 5 are all classified as synthetic. Dot 3 synthetic will mix with non synthetic Dot 3. Nothing has changed in regards to product classifications, and differences between Dot 3 synthetic & Dot 5 synthetic (still apples & oranges). Dot 3 synthetic will still attract water and melt your paint and Dot 5 is just the opposite.Would have been great though but to good to be true unfortunately. Link to comment Share on other sites More sharing options...
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