StacksVerified U.S. regulatory reference

40 CFR §1065.735

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Use commercially available diesel exhaust fluid that represents the product that will be used in your in-use engines.
  2. (b)Diesel exhaust fluid for testing must generally conform to the specifications referenced in the definition of “diesel exhaust fluid” in § 1065.1001. Use marine-grade diesel exhaust fluid only for marine engines.