i did wonder about that myself after looking at some of the other forums, but the pump went for a bit longer the first time, and no lights on the dash. will go for a proper run tonight, but i guess after doing this it could add a bit of air into the system. I did leave the cap off for a while to let any air bubble up but thats about it. As far as fluid goes i ordered Selespeed oil from the same place as the pump. I used ~ 3/4 of a lt but i did over fill slightly, and topped up again after i had used the pump a few times. I think the reservoir was empty by the time had finished removing and installing the new pump, hence the amount i used in filling it up again.