As most of you are aware, the American Petroleum Institute, ASTM and the Truck & Engine Manufacturers Association (EMA) have all agreed that the next generation heavy duty engine oil - scheduled to be introduced this December - will be called CK-4. That is, unless it's a lower viscosity oil (such as SAE 5W-or 10W-30), which will be called API FA-4. Of course CK-4 will also have an SAE 10W-30 grade but it will be different than the FA-4 version. Are you clear so far?
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