Just put £15 of unleaded in my wifes TDi! This is after reading a post on here a few days ago about the confusion surrounding the colour coding of diesel/petrol pumps. So then put another £38 of diesel in, which apparently sinks to the bottom and car is running fine. My question is what do I do next apart from not letting the tank get below half full? Will the problem eventually resolve itself, or do I need to syphon off the unleaded? Will the unleaded eventually mix with the diesel to such a degree that it'll get used up or will it sit on top forever?