What oil filter do I need? US/Canada 100 models: You need the smaller oil filter, which is Audi part
number 034 115 561 A.
US/Canada A6 models: You need the larger oil filter, which is Audi part number
078 115 561 D.
European models: If your VIN ends in 4A_S_026713 or earlier, you need the smaller oil filter, which is
Audi part number 034 115 561 A.
If your VIN ends in 4A_S_026714 or later, you need the larger oil filter, which is Audi
part number 078 115 561 D.
This is important! The later oil filter has several new features:
Dirty side anti-drainback valve with an opening pressure of 1.7 PSI
Bottom bypass valve with an opening pressure of 36 to 50 PSI at 0.26 GPM
Bypass filter screen to filter contamination once the filter goes into bypass
