Is there a how to oil change guide thread somewhere? Can't find it if there is. I've change oil in many cars before but not this one. Thanks

 

I don't want to sound annoying to folks with newer models, but on the C4 changing the oil is as simple as in many other cars.
However, guys like Kevin who own C5s and C6s can give you better answers.

Although not for an A6, here's a DIY oil change for a 2008 A4 with filter casing.
Also, there's another DIY regarding an Allroad, with the filter as a stand alone feature, similar to a C4.
good luck

 

What Engine size do you have?

 

3.2 engine size