JH Seale and Son Inc. is a Southeast-based petroleum transportation company, which has been family owned and operated for almost a 100 years! Safety of our drivers and customers is our #1 priority.
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Diesel Exhaust Fluid (DEF) is an emissions control liquid required by modern diesel engines. It is injected into the exhaust stream. DEF is never added to diesel fuel. DEF is sprayed into the exhaust, breaking down NOx gases into nitrogen and water using an advanced catalyst system.