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

Problem Description and Possible Solution
To avoid sludge accumulation inside the engine, our technicians recommend using the proper synthetic oil with the appropriate oil filter.
Problem Data
RepairPal Verified
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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Been using royal purple. Expensive but worth it.