Advice required for purchase of a 2nd hand car

[Pope John 11]

I am thinking of buying a secondhand car for under 20,000. My preferences are for the following:

1.9L TDI Volkswagen Passat
2.0L 320D BMW
1.9L Audi A4 diesel


Any advice appreciated

 

[ClubMan]

Car for under 20,000 euro

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