I just bought Halfords +150% H4 bulbs. From past experience on my wife's previous car, a Ford Convertible Coupé, where the original headlights were very poor on dip, these uprated bulbs don't last very long and I suspect with the vibration levels on the M3W, even shorter life but as I don't use it much at night, I will live with that. I will try and improve the aim this evening.
Wilson
