Most marine dealers, or you can use mil spec aircraft fluid, which is what is has now. The price tag is a bit more and it is good stuff. Though Teleflex fluid should be readily available. Before you fill it though, why do you need it as this is a closed system. If you need fluid you may have an issue. We do not suggest just filling it as if none leaked out. Our suggestion is to have a good wrench check it for leaks if there is a problem. One air bubble makes its way to the cylinder, and you could loose control. BCB
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