Audi S4 2010–2012 — technical service bulletin
Bulletin TSB-42-15-24 · NHTSA communication 10058579 · issued Jun 30, 2015
Technical service bulletin
communication type
Power Train
component
2010–2012
model years
6
vehicle entries
Official summary
Audi: on some vehicles, the rear differential side flange or axle shaft inboard flange is leaking oil from quattro sports and protective cap has insufficient sealant on inboard constant velocity joint near rear differential. Model 2010-12 s4, 5, cabriolet. *pe
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.