I was in WALMART today looking at brake fluid and notice they carry "Prestone Synthetic DOT 3 Brake Fluid". Has anyone used this? Is it paint friendly? How does it compare to DOT 4 fluid? Thanks
I knew I'd looked at this in the past, took me awhile to find the post: http://www.v8buick.com/showthread.php?t=120286 Devon
Everything I have read about the DOT 3 and 4 Synthetics is that they are still a poly gylcol based fluid with some addtives. Because of that they are not paint friendly like DOT 5. One of the biggest differences between DOT 3, DOT 4 and DOT 3&4 synthetics is boiling points. Non-synthetic DOT 4 has a higher boiling point than non-synthetic DOT3. Synthetic DOT 3 has a higher boiling point than non-synthetic DOT 3. Synthetic DOT 3 has a higher boiling point similar to non-synthetic DOT 4. Having said that, the average driver has no need for a raised boiling point beyond the limits of non-synthetic DOT 3. As far as mixing synthetic and regular DOT 3/4 they are listed as compatible. Some will say not to mix but can you imagine the law suits if they weren't 100% compatible? :eek2:
Just stay away from the DOT 5 fluid..But that is a story I have for another time.....:Comp: Russell 1970 Skylark Convertible 455
I called tech support once upon a time.... he told me one of the characteristics of the poly glycol is it causes rubber seals to swell slightly to produce a better seal. That component has the same effect on most paints... to swell and lift. I've been using epoxy on my frame and suspension parts. It holds up well to brake fluid leak spills.
