0-W-30 API SP What do the letters on the lubricants mean?

Each specification corresponds to a technology and viscosity required by each of the new engines.
What does API, SAE, ILSAC and the number before and after the W mean as 15-W-40?
Engineer Garibaldi explains it to you with Information of the level and depth appreciated by the world's most passionate #Motor shared in these Workshop Talks presented by MOBIL ™ Lubricants to learn clearly and simply the fundamentals of automotive technology.
#Mobil is a world leader brand in lubricants and has an exclusive line of products for all types of vehicles and engines and for each operating segment, which meets the most diverse specifications on the market. Mobil Delvac ™ for heavy and light trucks, Mobil Super ™ for automobiles, Mobil Super Moto ™ for motorcycles, and Mobil ™ for industry.
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