One problem related to engine noise has been reported for the 2009 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Audi A4 based on all problems reported for the 2009 A4.
Recently done oil change with synthetic oil (Audi recommended) which should last for 10,000 miles before another oil change is needed. Unfortunately after a month and half of driving oil levels are showing half of the oil gone. Engine is making noise and lot of co2 being clogged up. Running heavy causes to use lot of fuel. Feels as if engine may get too hot after eating up excess amount of oil.