Use correct oil/filter to prevent sludge accumulation on Audi A4

To avoid sludge accumulation inside the engine, our technicians recommend using the proper synthetic oil with the appropriate oil filter.
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Average mileage: 135,555 (111,111–160,000)
Engines affected: 1.8L 4 Cylinder Turbo, 3.0L V6
10 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003, 2004, 2005, 2006
12 people reported this problem
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2003 Audi A4 - 3.0L V6 111,111 mi,
Been using royal purple. Expensive but worth it.