Originally Posted By: JHZR2
If it is DOT 3 then it is DOT3. It is a glycol as I recall, which means it was likely synthesized regardless of the label.
IMO it is a buzzword to sell an item.
That's correct! All DOT 3, 4 & 5.1 are all synthitic. DOT 5 is silicone.
Brake fluids all the way back as-far-as I can remember, are synthetic.
I have noticed in the past 10 years that some bottles/brands of brake fluid mention in large letters, "SYNTHETIC" as though this is something new or better. It's marketing only!
I don't think that I have ever used anything other than DOT 3 brake fluid. Oh, I may have bought on sale some DOT 4 but, most of the time especially in the last 20 years or so, all I have used is store brand DOT 3 meaning, Super Tech, AdvnAutoParts, WearEver, ProLine DOT 3 brake fluids. Never an issue!
Even the auto parts store brand brake fluids state on the label: meets DOT 3/4 spec and bla-bla-bla...ABS brake systems.