Frequent Questions

ASTM updates test methods every five years. Will EPA issue a ruling that will allow the latest (most up to date) version?

The nonroad diesel rule contains a performance-based provision specifically for diesel sulfur that allows the use of any diesel sulfur test method that meets certain criteria for accuracy and precision. Under this approach, industry would be able to determine on their own whether updated ASTM test methods would be acceptable for compliance testing purposes.

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