GM to Open New Plant in Ohio to Produce Diesel engines by Sebastien Bell March 5, 2020 Share Comments Brookville, Ohio will be the location of a new plant designed to help GM produce 6.6-liter Duramax Diesel engines. The investment will cost GM $175 million and will supply the Silverado and Sierra HD with their diesel V8s. The 75-acre plot of land was bought last year for $3 million and the facility is expected to bring 100 new jobs to the region, reports GM Authority. The new plant could be a way to get ready for growth in its fleet sales, something GM says the sector is “poised” to do. The plant will machine blocks and heads, which will be sent to DMAX in Moraine, Ohio, a joint-venture plant that produces Duramax diesel engines.