This standard establishes a method for the determination of sulphated ash of not less than 0.005% (by weight) in commercial lubricating oils with additives, etc.
GOST 12417-1994 history
1994GOST 12417-1994 Petroleum products. Method for determination of sulphated ash
1973GOST 12417-1973 Mineral oils with additives and additives. Method for the determination of sulfated ash