In any car you buy:
- listen the engine for any wired sounds (it should be round and linear if that makes sense) - I would not buy any car wit weird sounds in the engine
- check if things are clean around the engine aka no leaks
- drive the car and listen to it - any wires sounds when starting the car, while driving, braking, steering etc
- differences in paint colour around the car - can use a magnet strip to check if any repairs on doors, wings, bumpers etc
- boot and stoplight compartments condensations or water in the stoplight (yes I have seen one in Audi dealer wit 1-2 cm of water in the extra compartments in the boot
- service history, when was the cam-belt changed if, last service etc
That’s pretty much I can think of for now
Be prepared to go around and see multiple cars not just one.
Before buying my last Audi I think I have seen 5 live and over 10 online - check the pics as sometimes they will tell you the car it’s a no go compare pics with what you see live (yes, Audi dealer refurbished alloys without diamond cut on rotors though pics were showing diamond cut on them)
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