Md. Code, Bus. Reg. § 10-308

(a) Before making the first sale in the State of gasoline imported into the State, the seller shall register with the Comptroller each additive introduced into the gasoline after it was received in the State. (b) The registration shall: (1) include the amount of additive blended into each gallon of gasoline; and (2) describe the additive by including: (i) its trade name, trademark, and manufacturer; (ii) its quantitative analysis; and (iii) the manufacturer’s trade name or other identification. (c) (1) An additive may be introduced into gasoline for resale or distribution by a person who holds a Class “A” dealer license issued in accordance with § 9–322 of the Tax – General Article. (2) The Comptroller may authorize any person who holds a dealer license other than a Class “A” dealer license issued in accordance with § 9–322 of the Tax – General Article to introduce an additive into gasoline for resale or distribution if the person complies with: (i) the requirements of this subtitle; and (ii) regulations adopted by the Comptroller, including regulations: 1. that specify the method for introducing an additive into gasoline, such as in–line blending or any method equal to or superior to in–line blending, as determined by the Comptroller; and 2. that provide for the payment of the motor fuel excise tax under § 9–305 of the Tax – General Article by a licensed dealer.