Internal combustion engines consume fossil fuels because of their nature which produces carbon and sediments.
Therefore, we use engine oil because of lubricating the engine parts, reducing the friction between moving parts of the engine, and reducing carbon particles and combustion deposits. Of course, engine oil must be produced according to the world standard and following its formulation. In this regard, the most critical standard and the most practical engine oil in production is API. The American Petroleum Association (API) has introduced several engine oil standards to the world until now, the latest and most up-to-date standard being the SPA.
Although the technology of internal combustion engines is nearing its peak and we are witnessing the most evolved driving forces, their sensitivity, especially turbocharged or supercharged engines can not be ignored. Accordingly, the engineers of the American Petroleum Association defined the SP level standard in their latest action at the end of last year.
This standard corresponding to the engine oil formulation provides more protection against ignition and even turbocharged engines during compression, more air, and more pressure. Of course, in addition to this standard for diesel cars, there is also the CI-4 Plus standard, which is now available, and 18 copies of it have been obtained for licensing from the most important manufacturers of engine oils in the world, however, given the API market share, it has 799 licenses that are applicable in 62 countries. 44% belongs to North America, 26% to the Asia-Pacific region, and 30% to other regions, although these licenses are for 19,000 liters of engine oil.