The best advice for owning any benz or bmw is to drive it, and drive it hard.
If you let it rest too much and baby/pamper it a lot, it will bite you.
Follow the recommended maintenance schedule, and keep a good trained and educated mechanic. And keep away from detailer/champi paalish ustaad. (They are usually the biggest culprits nowadays)
I usually stay clear of audi because of the assinine build of them.