For the past 8 months I've always filled up with Sainsbury's super unleaded. On Monday this week, I filled up with Sainsbury's regular unleaded.
Now there is a stutter, or hesitation during acceleration; not all the time but enough to make it noticeable. Could it be that I filled up from a poor batch of regular unleaded, or that the car runs best (smoother) on super unleaded? I can accept this for a 330i or M3 where it might make a difference, but surely not on a measly 316i ?
Anyone had any experience on this ?