40 CFR § 1065.735
Diesel exhaust fluid
June 9, 2020
(a) Use commercially available diesel exhaust fluid that represents the product that will be used in your in-use engines.
(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.
[81 FR 74191, Oct. 25, 2016]
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