Diesel fuel additives standards.

(a) Except as specified in paragraph (b) and (c) of this section, diesel fuel additives blended into diesel fuel that is subject to the standards in § 1090.305 must have a sulfur concentration less than or equal to 15 ppm on a per-gallon basis. (b) Diesel fuel additives do not have to comply with paragraph (a) of this section if all the following conditions are met: (1) The additive is added to diesel fuel in a quantity less than 1.0 volume percent of the resultant mixture of additive and diesel fuel. (2) The PTD for the diesel fuel additive complies with the requirements in § 1090.1120(b). (3) The additive is not commercially available as a retail product for ultimate consumers. (c) The provisions of this section do not apply to additives used in 500 ppm LM diesel fuel or ECA marine fuel. [85 FR 78469, Dec. 4, 2020, as amended at 90 FR 4346, Jan. 15, 2025]