It is unlawful for a manufacturer or distributor to advertise any offer of a rebate, interest or finance charge reduction, or other financial inducement or incentive for the benefit of the purchaser of a motor vehicle if the selling dealer contributes in any manner to that incentive program, unless the advertisement discloses that the dealer's contribution may affect the final negotiated sales price of the motor vehicle.
43 Tex. Admin. Code § 215.258