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Could be valve guide seals weeping a bit overnight. Try lifting your foot off the accelerator letting the wheels drive the car on over run, then accelerate fairly briskly if they is blue smoke it could be the valve guides.

Just looked at mine 2015 S line auto and I'm guessing the black plastic trim with the many little holes is replaceable and therefore available as a spare. Don't know easy it is to remove / replace but I would go to nearest scrapyard with a trim removal tool to see if they can be prized out. The three holes in your car would be for the clips to be inserted. Best o' luck! i'd try to remove mine to see if what I've said makes sense, but a bit scare of breaking them.

Sorry for the delay in updating this post, I had the battery replaced but unfortunately it was the Alternator that had died. The new battery lasted one day ended up getting the car towed back in to mu Local Audi specialist. I only use main dealership parts so you can imagine this wasn’t cheap job battery £200 + vat Alternator £657 + vat Surprisingly now the car is driving smoother I’m not sure if that’s because I didn’t drive the car for roughly a week. It’s just great to have the Audi back up and running.