On January 20, 2015 the Society of Automotive Engineers, better known by its acronym as SAE added two new viscosity grades to its most popular viscosity classification system defined under the SAE J 300 standard. The new viscosity grades are SAE 8 and SAE 12 defining new limits for future engine oils built for even better fuel economy.
The low shear rate KV limits for SAE 8, SAE 12 and SAE 16 overlap to allow greater flexibility in lubricant design.
These new viscosity grades allow the formulation and production of lubricants that enable better fuel economy. Honda was the first automaker to request the introduction of these new grades after having completed successful tests using oils with similar parameters. While these new viscosities certainly set the path for motor oil development for the time being you will not find any SAE 8 or SAE 12 oil on the shelves. And even when there will be actual products meeting these specs they will only be suitable for engines designed with these oils in mind. Other engines, including most older ones would not be well enough protected with these very thin oils.
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