Says DOT4 on the instructions, but ive always been told that running Dot5.1 over the top is absoloutly fine - hmm
Bleeding instructions here
http://www.formula-brake.it/PDF/spurgo/SPURGO_ING.pdfedit: Just checked other forums - DOT5.1 is fine to use - best to flush as much DOT4 out as possible, but won't make a huge amount of difference.