Dot 3 and 4 are Glycol based and are hydro attractant; Dot 5 is Silicone based and is NOT compatable with the other types. Mixing Dot 3/4 with Dot 5 can cause catastrophic seal failures/seizures.
The difference between Dot 3 and 4 is the amount of additives used to elevate the boiling point.
Dot 5 Fluid won't hurt your paint, but usually gives a spongier feel, and since it is non-miscable with water, the water gavitates to the lowest points of the sytem and causes corrosion.
Unless your system is specifically designed for Dot 5 and above, using it will garner few benefits.
JMHO
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