Wis. Stat. § 342.02: Excepted liens and security interests.

This chapter does not apply to or affect:

(1) A lien given by statute or rule of law to a supplier of services or materials for the vehicle.

(2) A lien given by statute to the United States, this state or any political subdivision of this state.

(3) A security interest in a vehicle created by a manufacturer or dealer who holds the vehicle for sale, which shall be governed by the applicable provisions of ch. 409.