Advice for someone looking to buy a v8 S5

Currently in the market for a fun v8. I don’t really mind service and maintenance, I’m looking for an Automatic, 80-105k miles that actually had their timing chain replaced. So far, haven’t found any with service history fitting my category 😂.

What are service intervals like? Any idea on costs to keep the thing running? (Yes I know it guzzles fuel lol).

Any advice is greatly appreciated!