Audi S6 v10 2007…
Torque qonverter on low rews and idle make scratchy noise, like metal to meta, mechanic told me that this is reason why some time engine is rough, jumping with revs and shaking car. Firs owner newer change oil and filter in gear box, after 7 years, still was there original filter with date on it, and oil was like old engine oil. Mechanic tol me that oil in gearbox must be changed once at year, even if you did 5 miles per year.
Im not going to Audi dealer’s service, don’t have trust anymore because i have bad experience with another car…