Audi A8 2013 — technical service bulletin
Bulletin Campaign Circula · NHTSA communication 10120717 · issued Feb 3, 2015
Technical service bulletin
communication type
Engine and Engine Cooling
component
2013
model years
4
vehicle entries
Official summary
The oil filter bypass valve on certain 2013 model year Audi 4.0L vehicles may not be present or may have been incorrectly installed during production.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.