15.2 For used oil samples report also the date of testing and,
when available, the date the sample was taken (see 10.2).
16. Precision and Bias5
16.1 Acid Number:
16.1.1 Repeatability—The difference between successive
test results obtained by the same operator with the same
apparatus under constant operating conditions on identical test
material would in the long run, in the normal and correct
operation of the test method, exceed the following values only
in one case in twenty.