Yes, I too found it odd that there were NO other vendors listed on the Sheet 331.0.
Don't get me wrong... I have no delusion that just because there is a M-B stamp on something, it makes it somehow "superior". I too will hands-down buy any of the other BeVo-Listed approved products, over M-B Bottled version, usually at a fraction of the cost.
I checked M98's reference to the Pentosin 4LV. On their Product Sheet? Mercedes is not even LISTED. http://www.pentosin.net/specsheets/pentosin_dot4_lv.pdf
I also checked the other Pentosin products, and have not seen any *APPROVAL* by M-B, only this: "OE REFERENCE NUMBERS/RECOMMENDATIONS".
"To Me", this is similar to an ATF fluid claim of "Meets Spec 236.10", rather than actually being "Approved".
Sooooo, I just went out and went to "The Horse's Mouth", and looked at the M-B Bottle (see attached photos).
First, as you can see, the Mercedes fluid is "DOT 4 *PLUS*". I cannot find ANY manufacturer for such a product. Right off the bat, I feel comfortable saying: ATE and PENTOSIN are **NOT** the manufacturers of the Brake Fluid inside the Sheet 331.0 APPROVED fluid bottle.
Flipping the Bottle Around?? What does it say?? " Manufactured by CCI Manufacturing IL Corp."
Trying to research that company? It appears to be a Japanese company. On THEIR site, they use the words "Approved by Daimler".
Now, I had a look at ANOTHER reference (see the BG Products attachment), and it claims BASF Europe is the maker of the DOT 4 PLUS fluid, in Europe.
The take-home message from my babbling??? I am, now, 100% convinced MB has a "Proprietary" Formulation for it's Brake Fluid, and thus, I am using M-B and *ONLY* M-B bottled fluid in ALL my vehicles!