Nothing in this Code shall be construed to prohibit a credit union, as defined in the Illinois Credit Union Act, a bank, as defined in the Illinois Banking Act, or any firm, copartnership, association or corporation from advertising the sale of motor vehicles by licensed dealers or advertising motor vehicle purchase opportunities from licensed dealers, from referring potential purchasers of motor vehicles to licensed dealers, or from soliciting purchasers of motor vehicles for licensed dealers. However, any motor vehicle sale resulting from those activities may only be consummated by a dealer licensed under Section 5-101 or 5-102 of this Code.