http://www.bimmerhaus.com/tech/vanos.html

If one "lump" in front of camshaft: SINGLE Vanos (early 1998 or so).....fewer problems

If two "lumps" in front of camshaft: DOUBLE Vanos (? later 1998 and 1999+).....more problems...Hope there is a fix for Double Vanos fellows

cn
1998 528i single vanos