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dot 3 and 4 both produce water and eventually will rust out your lines/parts. dot 5 is silicone based and won't do that. if you use 5, you can ONLY use 5.



produce water? they absorb moisture which can rust your entire system. the dot5 doesn't absorb moisture but i have read that since it doesn't absorb moisture that the moisture can collect at the wheel cyl and calipers. just bleed the system once a year and you should be fine.