All brake fluid is "synthetic" whether it says so on the can or not. It's
not made from petroleum distillate.
Yes, DOT 4 will absorb water, eat paint and so on. Castrol claims theirs
absorbs slower than others (the "LMA"), but it still absorbs.
DOT 5 is a completely different chemistry, a silicone oil rather than the
glycols used in DOT 3, 4 and 5.1. It does not absorb water, eat paint,
become corrosive over time, etc.
Look for the word "silicone" on the label. DOT 5 must have it, the others
cannot have it.
The word "synthetic" is totally meaningless for brake fluid.
FWIW, both of my Stags have DOT 5 in them.
-- Randall
> I'm rebuild brakes and clutch with new seal on a Stag. I have
> this brake fluid
>
> https://www.bpnorthwest.com/fluid-brake-clutch-castrol-lma-12-
> oz.html
>
> which says DOT 4 synthetic (Castrol) . If it is synthetic,
> will it absorb water?
>
> I'm a bit confused as people are saying get DOT5. synthetic.
> Is the buzz word synthetic?
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