1.2 The test method may be used to indicate relative changes that occur in oil during use under oxidizing conditions
regardless of the color or other properties of the resulting oil.
Although the titration is made under definite equilibrium conditions, the test method is not intended to measure an
absolute acidic property that can be used to predict performance of oil under service conditions. No general relationship
between bearing corrosion and acid number is known.
NOTE 2—The acid number obtained by this standard may or may not be
numerically the same as that obtained in accordance with Test Methods