Gallnack Eccentric Shaft Valve Actuator for BMW Valvetronic — N20/N55/S55

This unit is built to OEM specification and comes factory pre-lubricated, meaning the internal mechanism is ready to operate correctly from the moment it's seated. That upfront lubrication isn't just a convenience — it reduces break-in wear and contributes to a longer service life compared to dry-install alternatives. It directly replaces OEM part numbers 11377603979 and 11377599021, so there's no guesswork on fitment.

Installation is straightforward. Each unit ships with two pre-assembled wiring harnesses, allowing for a genuine plug-and-play swap with no splicing, no pin swapping, and no aftermarket adapters required. For a system as sensitive as Valvetronic, having the correct connectors ready to go is worth more than it might seem — it eliminates one more variable when diagnosing whether the repair is complete.

If your 328i, 435i, M3, X3, or any other compatible model has been throwing Valvetronic faults, this Gallnack actuator is a cost-effective path back to factory throttle feel without the dealer markup. For engines that have seen higher mileage or deferred maintenance, pairing this actuator with a fresh Valvetronic motor at the same time is a smart move to restore the full system in one go.