This subchapter does not affect:
1. Liens for services or materials. A lien given by statute or rule of law to a supplier of services or materials for the vehicle;
2. Government lien. A lien given by statute to the United States, this State or a political subdivision of this State;
3. Salvage lien. A lien given for a salvage vehicle, except when the vehicle is repaired or rebuilt for operation on a public way; or
4. Manufacturer's lien. A security interest created by a manufacturer or dealer who holds the vehicle for sale. A buyer in the ordinary course of trade from the manufacturer or dealer takes free of this security interest.