I have a dci 106 and a couple of weeks ago filled up my tank with Shell diesel. Ever since it has been running rather rough, noisy and a noticeable lack of power. I ran it down to almost empty and then filled right up with BP as i normally do. Almost immediately i noticed the difference. More smoother, quieter and power seems to be at the ready a lot more. Anyone had any similar problems like this with fuel from different stations?