What oil filter do I need? If your VIN ends in 8C_S_025820 or earlier, you need the smaller oil filter, which
is Audi part number 034 115 561 A.
If your VIN ends in 8C_S_025821 or later, you need the larger oil filter, which is
Audi part number 078 115 561 D.
This is important! The later oil filter is larger, and 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