MSHA - Code of Federal Regulations - 30 CFR 75.1901
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MSHA - Title 30 CFR
30 CFR § 75.1901
Diesel fuel requirements.
(a) Diesel-powered equipment shall be used underground only with a diesel fuel having a sulfur content no greater than 0.05 percent and a flash point of 100 deg. F (38 deg. C) or greater. Upon request, the mine operator shall provide to an authorized representative of the Secretary evidence that the diesel fuel purchased for use in diesel- powered equipment underground meets these requirements.
  (b) Flammable liquids shall not be added to diesel fuel used in diesel-powered equipment underground.
(c) Only diesel fuel additives that have been registered by the Environmental Protection Agency may be used in diesel-powered equipment underground.