Hi I'm new to this but here goes.... My a6 estate 2007 sometimes when i try to start it it turns over but makes a horrible like clatter noise and shudders a bit then then starts like nothing happened, sometimes if it goes on a little longer the oil pressure logo comes up on the dash so i turn it off and try again and its fine. It happens probably once a month and thats it! I was wondering if it could be something to do with the fuel pump?? Cheers for any help or advice 😃 Simon