Well, so I went to have a look at the car since it was located right outside the town I live in. Turns out that the kid who owns it had the engine repaired already, without editing his for sale ad. So, the car naturally was now in the 3000 euro range, and not of interest to me.

Thanks for all the replies, guys!

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If you have a 5 cylinder, you don't need a stereo.

1999 Audi A6 quattro
1990 Volkswagen Golf CL Syncro
1987 Audi Coupe quattro