I bought the best 4.2 A6 I could find. It had 75,000 miles, but it was in perfect shape. I drove a bunch of them. It is beautiful, comfortable and drives nice. The power is nice, but it is not a very ...

Sulfur in the fuel interacts with certain additives found in widely available gasoline, causing sulfur to become deposited on the contact points of the fuel sending units mounted inside the fuel tank.