Yes, if you want best performance and lifetime from yours engine !!!
If you have 1.9 TDI pump-nozzle engine AUDI recommends CASTROL 0 W 30 Longlife II SLX Professional VW 506.01 Norm, special designed for extended service interval (longlife < 50000 km !!!) If you have 2.5 TDI V6 engine, longlife < 30000 km. If you have 1.6, 1.8, 1.8 T, 2.0, ... petrol engine AUDI recommends CASTROL 10 W 60 RS Formula - full synthetic engine oil.
I do,but no you dont
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