16 C.F.R. § 311.4
To determine the substantial equivalency of processed used oil with new oil for use as engine oil, manufacturers or their designees must use the test procedures in API 1509, Engine Oil Licensing and Certification System, Seventeenth Edition, September 2012 (Addendum 1, October 2014, Errata, March 2015). The Director of the Federal Register approves this incorporation by reference in accordance with 5 U.S.C. 552(a) and 1 CFR part 51 . You may obtain a copy from API, 1220 L Street NW, Washington, DC 20005; telephone: 202-682-8000; internet address: https://www.api.org. You may inspect a copy at the FTC Library, 202-326-2395, Federal Trade Commission, Room H-630, 600 Pennsylvania Avenue NW, Washington, DC 20580. It is also available for inspection at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030 or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
16 C.F.R. §311.4