I do all the maintenance on all my vehicles, and that includes the Audis listed in my sig.
I belong to the Audiforums (
AudiForums.com - Powered by vBulletin) and I noticed that I get a lot of technical info on the A6 section whereas in the A4 section you will mostly find kids whose only concern is to lower and debadge the car (all about looks).
As previously mentioned audizine.com is also good, and I like audidiy.com.
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Gilles
Happiness is not having a Porsche in the garage... Happiness is having a Porsche on the road!

86 Porsche 911 Cabriolet, 2015 BMW K1600 GTL, 2011 BMW X3, 2016 BMW 435i hard top convertible