DETROIT, MI — Federal regulators have fined two Oakland County businesses $350,000 for selling aftermarket products that bypass emission controls on diesel engines. Green Diesel Engineering LLC and ...

Two Metro Detroit companies settled with the U.S. Environmental Protection Agency after allegedly selling devices designed to bypass or disable vehicle emissions control systems, the EPA announced ...

The $39-million Diamond Green Diesel No. 2 Plant Expansion was designed to more than double the capacity of renewable diesel at DGD’s Norco, La., refinery. Construction involved the logistical ...

Valero Energy and Darling Ingredients said Monday they're planning to build a massive renewable diesel refinery in Port Arthur. The companies, which have a 50-50 joint venture called Diamond Green ...