NF ISO 3987, T60-143 (10/2024)

ISO 3987:2010 specifies a method for determining sulfated ash in new lubricating oils containing additives and in the additives themselves. These additives usually contain one or more of the following metals: barium, calcium, magnesium, zinc, potassium, sodium or tin. The elements sulfur, phosphorus or chlorine can also be present in combined form. The application of this method to sulfated ash levels below 0.02% (m/m) is limited to oils containing ashless additives. The lower limit of applicability of the method is 0.005% (m/m) sulfated ash.
(Automatic translation from French)