hi Trevor thanks for getting back. The leak comes from the middle of the pipe, the clips are tight. The leak is just a few drips if the cars been worked hard or driving hard in sports mode, it's fine when driving normal been looking at engine diagrams and can't single out the the part. I know the S8 is a rare car and that could explain the lack responses or people with knowledge on this particular model. Will check the colour of the fluid next time as it was low light last time i noticed the leak. Thanks trevor