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Originally Posted by aNtHrAx323
What is the composition of Castrol GT-LMA brake fluid? It's the only brake fluid I ever use, and my uncle recommends it for any and all cars (specifically the Dino... Apparently it's not harsh on seals and such). I don't have a bottle handy to perform the test, but my car is going to need a brake system flush sometime soon. I'd like to know out of curiosity if it's silicone or glycol.
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Castrol LMA is a DOT 4 glycol-based brake fluid. Mercedes recommends DOT 4 brake fluid, and I've used Castrol LMA in all my cars for over 20 years.
All brake fluids are "synthetic" because they are "synthesized" in a petrol chemical process, but they are very different and will not mix with "synthetic" or any other motor oils.
Another commonly avialable DOT 4 is Valvoline Synthetic. "Synthetic" in this case is meaningless because all brake fluids are "synthetic" (including DOT 5 silicone-based brake fluid), but it probably has some "marketing value" to typical consumers who might think it's something special because of the name. It's just another DOT 4 brake fluid, and I would rather use Castrol LMA just because of this dumb, misleading name that Valvoline chose for their DOT 4 brake fluid.
Duke
Duke
04-30-2005, 07:31 PM
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