(a) Definition. Products formulated to improve the performance and efficiency of engines by providing benefits such as removing accumulated deposits, increasing lubricity, removing moisture, increasing the cetane number, and/or preventing microbial growths within the fuel system.

(b) Minimum biobased content. The Federal preferred procurement product must have a minimum biobased content of at least 64 percent, which shall be based on the amount of qualifying biobased carbon in the product as a percent of the weight (mass) of the total organic carbon in the finished product.

(c) Preference compliance date. No later than November 19, 2013, procuring agencies, in accordance with this part, will give a procurement preference for qualifying biobased fuel conditioners. By that date, Federal agencies that have the responsibility for drafting or reviewing specifications for products to be procured shall ensure that the relevant specifications require the use of biobased fuel conditioners.