A quick rule of thumb to estimate what would be 'affordable': assuming a 60 month loan term at a single digit interest rate, your monthly payment would be about $19 for every thousand financed. This isn't exact but it will get you into the right ballpark.
In the example above, if you put $20K down on a $70K car and financed $50K over 60 months, your monthly payment would be something in the $950 range. Similarly, if you wanted to keep your monthly payment to something around $600, then the most you could finance would be about $31K.
Assuming that an A4 can be had reasonably loaded for $50K after taxes, tags, etc., then you'd need a down payment of about $19K to get to your monthly payment goal.
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