From armtdm a member on one of my Hyundai forums. he wrote to the company listed on Amazon.
Good morning! All oils are API SN/ILSAC GF-5 and have the API certification, that is checked in the API org website, but the Donut Starbust is not printed in the bottle labels. You can check all the specs in the hyundaixteer or xtremelub online.
Also, It's produced in Hyundai Oilbank Daesan factory in Chungnam, South Korea, which has total of 390 thousand barrels of petroleum refinement capabilities per day including the 110 thousand barrel from
1st factory and 280 thousand from 2nd factory. Hyundai Oilbank has established Hyundai Shell Base Oil factory which produce 650 thousand ton of lubricants per year by cooperating with Shell in 2012.
In 2013, Hyundai Oilbank has completed the vertical systematization of lubricant business of oil refining-lube base oil-lubricant by releasing the HYUNDAI XTeer, a vehicle lubricant. Also, It's produced in Hyundai Oilbank Daesan factory in Chungnam, South Korea, which has total of 390 thousand barrels of petroleum refinement capabilities per day.
If you have any other question, let us know. Regards, Fabio Vieira Xtreme Lub - Exclusive Distributor