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New specifications come into effect: API CK-4 and FA-4

New specifications come into effect: API CK-4 and FA-4

Yes, 2016 is over, but there is one more change to be accounted for. As of December 1st, new API specifications for the new category 11 oils (PC-11) came into effect. The new specs will replace the CJ-4 classification with a split category for High Temperature High Shear viscosity grades (HTHS). With the split in categories, it is important to take note of the differences between the two.
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