I bought my A6 Quattro new and now it gained over 200K of mileage and still going strong. The weather changed its states unpredictably but my A6 didnt change a bit of its performance. I have now owned another Audi (S7 Sportback) and since the first, I have not looked at other German made brand. "Truth in Engineering", that's right.
Of course, Audi invented and famous 4WD is my favorite feature among others like solid built, reliabilities. One thing about Audi that I considered a positive (others consider negative) is the difficulty to find after market parts. That's make any after market parts that fits and work to be genuine. It's a challenge to pimp or mod an Audi, and it's also a fun thing to do.
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