GM announces $920M investment in Ohio truck engine plant

IUE-CWA 755 Jason Schiely

General Motors plans to invest at least $920 million to expand its DMAX truck engine operation near Dayton, Ohio, it announced today.


The company said it will expand the existing 250,000-square-foot Brookville, Ohio, facility, building a 1.1 million-square-foot addition.

GM did not say specifically what products the engines would be for, or the timing, but this quote from Mike Trevorrow, GM’s vice president of North America manufacturing, offers a strong hint:

“This investment furthers our commitment to HD truck market dominance with the Duramax power under the hood that customers love so much,” Trevorrow said in a statement. “Additionally, it is truly a testament to the hard work and dedication of our DMAX team members in the state of Ohio who build world-class powertrain products.”


The DMAX operation began as a joint venture between GM and Isuzu in 1999, building Duramax diesel engines for the Chevrolet Silverado HD and GMC Sierra HD. Since last year, DMAX has been wholly owned by GM. The Brookville site opened in 2021 and builds engine components for the nearby Moraine operation.

A GM spokesperson told Automotive News that the automaker plans to move current employees at the Moraine facility to Brookville as production there increases. “We have no announcements to make at this time beyond the current product for the Moraine plant, but after this engine program builds out the plant may be considered as we evaluate future program allocation,” the spokesperson said.

This comes on the heels of an announcement that General Motors plans to invest more than $1 billion in two Flint, Michigan, manufacturing plants for trucks.




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