15.1 Given there are two different ways to determine the endpoint, report the type of endpoint used: inflection point or buffer endpoint. Report sample size used if differs from the recommended sample size. Also, report if chloroform was used as solvent. Report the results as acid number or strong acid number as follows:
Acid number ~Test Method D664, Test Method A! 5 ~result! (3)
Strong acid number ~Test Method D664, Test Method A! 5 ~result!(4)
15.2 For used oil samples report also the date of testing and, when available, the date the sample was taken (see 10.2).