I have had my a4 1.8t sport 1999 (80,000m) about a year since i have had the car there has been a slight rattle from somewhere inside the hood it dosent sound like any grinding and its not getting any worse its only for about a minute when you are taking off starting the car from cold . I took the car to audi in inverness a week or so ago and left it overnight they tried a oil pump test and said the pump was fine and that it was possibly just that it takes a bit of time for the oil to circulate round the engine . Im just curious if its a common thing for the noise to be there or if it could be something else any ideas .