The Agency has adopted a performance based test method approach which would set forth criteria to determine the acceptability of use of voluntary consensus standard based analytical test methods.

Under this approach, industry would be able to determine whether test methods allowed under the low sulfur gasoline rule may also be utilized under the low sulfur diesel rule.

Question and Answer was originally posted at Questions and Answers on the Clean Diesel Fuel Rules (PDF)(135 pp, 888 K, EPA420-B-06-010, July 2006, About PDF)