2 Valve V6 engines on Audi 80, 90, A4, A6 1994-97 ABC, AFC. Wide application range because of adjustable camshaft locking tool, to be used as OEM 3391 or OEM 3243. A8 2.8 1997-2002. Crankshaft locking bolt to be used as OEM 3242 is needed for changing of the tooth belt on Audi and VW with following engines.