You don't want to. It's in the rear, in front of the gas tank and hard to reach. You have to loosen the tank. This job needs a lift and an hour or two.
is your a4 diesel ?
audidiy.com
How do I change the oil filter on an Audi A4 Diesel 2007
Have a pro go at it, PITA to replace.
Fuel flter, air filter, spark plugs.
It is in the middle of the engine but at the bottom. Its really hard to get to, looks like a can of beans
The 2013 Audi A4 runs on premium unleaded (required).
The 2004 Audi A4 runs on premium unleaded (required).
The 2006 Audi A4 runs on premium unleaded (required).
The 2001 Audi A4 runs on premium unleaded (required).
The 2002 Audi A4 runs on premium unleaded (required).
The 2009 Audi A4 runs on premium unleaded (recommended).