alright so the outcomes



yesterday it was 3C, i put 150ml of fuel antifreeze on a half full tank , but i decided to wait for today to start the car because it was warmer, 7C today .. and it start like a charm, but idle was rought, car was shaking, so i press gas to 1300rpm still in P and it was smoother .. i then stop, but rough idle came back, so i put to D and went for a ride and then no problem


so how likely the problem was really the fuel freezing .. on a 1/2 tank ?

__________________
BMW X5 3.0i 2006