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Originally Posted by benebob
Although it isn't mixable with DOT 3 so personally I'd stay away unless you can come up with a way to evacuate all the Dot 3 and then install dot 4 which is easier said than done. You can get very good DOT 3 with Valvaline Synth. (tan/gold bottle) which has a very high boiling point and is very cheap to buy. So long as you keep your fluid water free and aren't on the track 5 hours at a time you'll be happy with it.
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Are you sure about this? I've been under the impression that DOT 4 was backwards compatible.
I do know DOT 5 is not compatible with any other brake fluid and requires a complete flush and replacement of all rubber parts before usage.