Trade mark number: 
At the time of filing this trade mark was owned by American Petroleum Institute, an American trade association that represents the American oil and natural gas industry.
The rules governing the use of this registration certify that engine oils for a particular purpose meet the minimum performance standards of vehicle and engine manufacturers as determined by the most recent and applicable International Lubricant Specification Advisory Committee (ILSAC) minimum performance standards.
Certification rules: 
1831951_final_rules.pdf PDF in PDF format [2.35 MB]