California Business And Professions Code Section 13450

The department shall establish specifications for compression-ignition engine fuel, kerosene, and fuel oil. The department shall adopt by reference the latest standards established by a recognized consensus organization or standards writing organization such as the American Society for Testing and Materials (ASTM) or the Society of Automotive Engineers (SAE), for compression-ignition engine fuels, kerosene, and fuel oil, except that no specification shall be less stringent than required by any California state law. (a) Diesel fuel shall meet the specifications set forth in ASTM D-975, except that sulfur specifications shall not exceed the maximum specified by any California state law. (b) Kerosene shall meet the specifications set forth in ASTM D-3699. (c) Fuel oil shall meet the specifications set forth in ASTM D-396, except that sulfur specifications shall not exceed the maximum specified by any California state law.