I second the VWVortex. I went to that site shortly after we first got our VW Passat. I haven't been to it in a long time, but as I remember it, it was very informative and it covered all VW models.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member