I was so impressed with Amsoil products that I became a dealer. For my 1999 Passat I have used Amsoil products since I have owned the car. You will find on the Internet that this car has had sludge problems in general. Doing an engine flush and then using synthetic oils will reduce the probability of sludge problems because these oils hold up better than conventional oils. Amsoil Series 2000 racing oil is really the best and holds up the best. It is far superior to anything on the market.
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