Dot 3, Dot 4, Dot 5, Dot 5.1, synthetic race, etc.
DOT 3/4/5.1 are all glycol ether based and backwards compatible. DOT5 cannot be mixed with any of the other three.
What kind you put in doesnt matter as long as you put in the correct grade or HIGHER. Dont put DOT 3 in a system designed...