Disclosed herein is an apparatus and method for adding a lubricating additive to a diesel fuel. In one embodiment, a system for controlling the release of a fuel additive into a diesel fuel is provided, the system having: a housing having at least one inlet opening and at least one outlet opening configured to define a flow path therethrough; filter media disposed in the flow path, the filter media comprising an adsorbent that removes sulfur containing compounds from diesel fuel passing through the housing; an additive cartridge configured to disperse a lubricating additive into the diesel fuel; a controller for controlling the amount of lubricating additive that is released from the additive cartridge into the diesel fuel; and at least one sensor configured to monitor the lubricant additive content in the diesel fuel and provide a signal indicative of the lubricant additive content in the diesel fuel to the controller, wherein the controller releases the additive from the additive cartridge based upon the signal received from the at least one sensor.