Cal. VEH § 665

A “used vehicle” is a vehicle that has been sold, or has been registered with the department, or has been sold and operated upon the highways, or has been registered with the appropriate agency of authority, of any other state, District of Columbia, territory or possession of the United States or foreign state, province or country, or unregistered vehicles regularly used or operated as demonstrators in the sales work of a dealer or unregistered vehicles regularly used or operated by a manufacturer in the sales or distribution work of such manufacturer. The word “sold” does not include or extend to: (1) any sale made by a manufacturer or a distributor to a dealer, (2) any sale by a new motor vehicle dealer franchised to sell a particular line-make to another new motor vehicle dealer franchised to sell the same line-make, or (3) any sale by a dealer to another dealer licensed under this code involving a mobilehome, as defined in Section 396, a recreational vehicle, as defined in Section 18010.5 of the Health and Safety Code, a commercial coach, as defined in Section 18012 of the Health and Safety Code, an off-highway motor vehicle subject to identification, as defined in Section 38012, or a commercial vehicle, as defined in Section 260.