Hi guys, bit of advice please, while i was away with work recently my dad decided that my car could do with the brakes bleeding and topping up with brake fluid, great i thought until i realised he'd put dot 4 in it and not dot 3 and mixed them together. Is this going to be a major issue does anyone know? Ive searched google and there doesn't seem to be an issue as apparently there pretty compatible but just want to make sure theres not a specific suabaru problem?