DOT 3 and 4 Synthetic brake fluid by Prestone

[imported_bill pritchett]

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?

[Ron Green]

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.