I have been using Valvoline brake fluid for the last few years without an
issue and it says compatible with DOT3/4.
https://shop.advanceautoparts.com/p/valvoline-dot-3-and-4-brake-fluid-32-oz-601458/7080002-P?searchTerm=brake+fluid

As far as I know the differences between DOT3 and 4 are very small and they
can be mixed. The DOT5 CANNOT be mixed with the two.

On Fri, May 4, 2018 at 2:37 PM, David McNeely <davmcneely40@gmail.com>
wrote:

> IIRC (but check the owner's manual), the correct brake fluid for the
> Vanagon is DOT 3.  It matters, because they have different volatility, and
> different ignition temperatures.  Whether they are mutually soluble or not,
> I am not certain, but I would not mix them, just as I would use the type
> recommended by VW.
>
> On Fri, May 4, 2018 at 9:27 AM, ddbjorkman@verizon.net <
> ddbjorkman@verizon.net> wrote:
>
> > Can one mix Dot 3 and Dot 4 brake fluid in a Vanagon brake system, or is
> > that not recommended?
> >
> > Dave B.
> >
>