To make the numbering system on brake fluid even more confusing, DOT 5.1 is
a non-silicone brake fluid, which is compatible with DOT 4 (and DOT 3,
which I don't think is even sold any more.)
Castrol GT-LMA is rated as DOT 5.1 and is an excellent choice for systems
that have not been switched to silicone DOT 5 brake fluid. It has excellent
moisture management and heat tolerance characteristics.
But please, folks, let's not get started on preferences for silicone versus
non-silicone fluids. If the car has never had its brake fluid changed, then
it hasn't had the seals changed either, and should get replacement
non-silicone (Dot 4 or Dot 5.1) fluid.
Cheers
gary
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