08-03-2011, 05:46 PM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
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Not Ranked
While it has very good high temperature qualities DOT 5 is not very tolerant of water (which is fine if you're changing it after every race). If not, the water which finds its way into the system may not be absorbed by the fluid and is then able to rust components. DOT3 is much better at absorbing water and therefore makes a much better fluid for daily drivers.
Bob
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