That stands for Engine Oil Licensing and Certification System.
It is by API and it is a list that shows the oils that meet their API Starburst.
http://eolcs.api.org/DisplayServiceCategories.asp
Interestingly, Caltex Singapore shows up in the SL category and they actually make Delo 400 and Delo Gold SAE30 oil. Dunno if we can get our hands on it.
Delphi Automotive Systems of Singapore blends the Delphi oil. Good news to Vit4WD. He can press for cheaper oil because it is local.
Among the names that came up is Carrefour! Yes, Total Lubrifants makes Carrefour 5W30 and 5W50 oil.
Check it out. An interesting look into who markets and blends the oil.