Natural rubber seals melting with modern hydraulic fluid is said to have
been a problem in the 50s
http://www.liquid115.com/brake_fluid_for_classic_and_vintage_cars.html but
that would have been on cars that were old then, which excludes the MGB and
probably the MGA. Castrol LMA exceeds DOT4 and DOT4, apparently
http://www.castrol.com/castrol/sectiongenericarticle.do?categoryId=9012213&contentId=7024043,
but not as good as DOT5.1/Super DOT4. It also mixes with DOT4 and DOT5 and
is ethylene glycol based so not that different to DOT3, DOT4 and DOT5.1
glycol. One swallow doesn't make a summer.
----- Original Message -----
> Yeah, it may be superstition at this point. But after having the MC seals
> dissolve back in the 80s, I have been religious about using Castrol LMA.
> Which is rated DOT 4, I believe. It also seems to use a different chemical
> base than "generic" DOT 4, so there may actually be something to it.
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