When DOT5(silicone) meets DOT 3/4 it gels. clogging your brake lines like cholesterol. You can only use DOT5 on cars that have it already or brand new virgin lines and brakes.
DOT4 is just like DOT3 version 2.0. All DOT3 cars can run DOT4 but, DOT4 cars will Boil DOT3 fluid. It's a good idea to run DOT4 if you are doing any hard driving or performance pads. DOT3/4 play well together but you should still flush all that old shit out anyways.
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Comments should be taken as Opinions not as Statements of Fact
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