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I think the best clutch fluid is clean clutch fluid.
You can spend as much as your wallet can afford on the "high performance" and expensive stuff, but if you put clean new stuff in, ANY clean new stuff in, on a regular basis via the "ranger" method, your clutch will be happy.
It's so easy to flush the reservoir on a regular basis I don't see the point in putting in expensive stuff for the short term anyway.
and that is just my opinion
Hence, my response
Swap it regularly, keep it clear, and stop wasting your money on expensive fluid.
DOT 3 wet is only 284, DOT 4 wet is 312 from what I know so I'd say anything in this range is more than ample unless you get the fluid hot enough to boil. In a clutch like this I doubt you would. There's nothing wrong with running some of the other ideas tossed out just know that many of them won't hold that high number for as long. I just see it as over paying for the need is all. (not to push one brand or the other)
DOT 3 wet is only 284, DOT 4 wet is 312 from what I know so I'd say anything in this range is more than ample unless you get the fluid hot enough to boil. In a clutch like this I doubt you would. There's nothing wrong with running some of the other ideas tossed out just know that many of them won't hold that high number for as long. I just see it as over paying for the need is all. (not to push one brand or the other)