just driving home from work tonight thought id squirt the windscreen and scrape away the flys only a little trickle coming out of the jets then nothing at all got home checked resevoir is empty. Nothing strange there then but i wasnt warned with a light on the dash checked my manual no mention of a tell tale light on the dash to say your low so i assume z4s dont have this function am i correct in this as my old 330 clubsport had one? As did my previous 6 BMWs