You can start by reading the owner's manual. Audi cars MUST have oil that meets specification 502/505, or damage can occur.These engines are special because they have piston squirters in them. Chances are you have noisy lifters from improper oil usage. NO VALVOLINE!! EVER! You can use a good de-sludging chemical, like SEAFOAM or Amsoil Crankcase Cleaner. Then use one of the PROPER oils like Mobil One 0W-40, ELF, Pennzoil Ultra, Amsoil, Pentosin, Lubro-Moly/ These oils will continue to clean as you drive. ALSO check your crankcase ventilation hoses, as they corrupt with improper oil usage as well. Clean out your IDLE AIR CONTROL VALVE. then ENJOY THE RIDE!!!