Possibly leak from gearbox rear output or one of front output seals, rear is very common, drips on cat and creates awful smell. Another thing is power steering hoses leaking and while they do not normally drip on exhaust some of the oil can be blown on exhaust by wind when at speed.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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