The A8 isn’t galvanised it’s an all aluminium chassis on the A8 😉 so it’ll never rot, unlike the mini, which probably already looks like a sunken ship underneath 🤣

2.8 is fine as above, nothing special, but an A8 is a lovely car, it’ll feel a lot better than the mini that’s for certain and if it’s coming from a good source then your in good stead, the boxes can be a bit problematic sometimes, good servicing is always key.