Technical advice for the Audi A4

[H_Queen]

Heya! I wasn't sure if this was the best section to post in, but I have a few tech questions about a used Audi that I'm considering buying!

Long story short, I need to get a bigger car and the Audi A1 I have, I've had it a while, so an upgrade is due. But I can't afford a new one and I want to stick with an Audi, so I've been looking around and found this great Audi A4 which is bigger than my current Audi.

However, I've never owned a used car before, so could anyone help me with the tech specs to tell me if it's any good?

All help welcome, and thanks in advance!

Helen