S54 Vanos Procedure (E46 M3) ↗
Full remove-and-refit of the S54 VANOS with the oil pump disk, sealing-plate rings, piston seals and solenoid pack renewed; long tool list and timing-lock steps. Beisan quotes about 5 hours for a mechanic and 7+ hours DIY, and suggests pairing it with a valve adjustment.
Tools mentioned: Cam timing tools, 32 mm fan wrench + pulley holder, picks, sockets incl. 32 mm, torque wrench
Vendor DIY (sells the seal kits).