Where is the non-synthetic/regular terminology for brake fluids coming from? All the DOT 3,4,5.1 fluids I'm aware of are based on glycol ethers. All glycol ethers are synthetic materials.
It's starting to show up on the bottles. I haven't really looked into what difference (if any) there really is, other than claims of "better corrosion protection" and "longer rubber part life". Might just be an advertizing ploy, slap the term "synthetic" on it and raise the price. As mentioned, I've only seen it on DOT 4 and 5.1.
